The “博多” (Hakata) in the shop name, and the “博多” and “福岡” (Fukuoka) in the product name shown on Rakuten Ichiba’s product page, are the shop name and a name used for the product; they do not indicate where the raw ingredient comes from (the product page states the country of origin of the walleye pollock ovaries used as the raw ingredient as Russia or the United States). Taking into account that the product page describes it as a “wakeari” (imperfect/irregular, sold at a discount) item packed with mentaiko whose roe broke or that was cut into small pieces during production, this article organizes the amount, shelf life, ingredients, gift suitability, and reviews of Umamido’s (うまみ堂) uncolored karashi mentaiko (chili-seasoned pollock roe) in small cut pieces (“kogire”), 1kg. Because how many servings it makes, whether heating is required, and whether it can be refrozen could not be confirmed on the product page, they are marked as not confirmed.
*The Amazon link goes to the same store’s item in different specifications (Amazon: a choice of 1kg × 1 box or 1kg × 2 boxes; Rakuten Ichiba: 1kg combined with a selectable bonus item). The amount and contents in this article are based on the Rakuten Ichiba item. Please check the details on the Amazon product page before purchasing.
What We Confirmed
- Amount (number of servings is not confirmed)
- Storage method and shelf life
- Ingredients and allergen labeling
- Whether it works as a gift
- Trends in public reviews
Basic Information
This table transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
| Product name | Name used in this article: uncolored karashi mentaiko (kogire), 1kg. The product name shown on Rakuten’s product page is longer than this and includes the words “博多” (Hakata) and “福岡” (Fukuoka) and the names of the selectable side dishes (the rest is omitted) |
|---|---|
| Name | 無着色辛子明太子(小切れ)Source: Rakuten Ichiba product page (viewed September 30, 2026) |
| Amount | 1kg. Number of servings: not confirmed (not stated on the product page)Source: same as above |
| Selectable bonus item | The bonus-item selection field is a choice of six options: none / 数の子醤油漬 (soy-sauce-marinated herring roe) 300g / いわし明太 (sardines with mentaiko) 2 fish × 2 packs / 明太いわし煮 (mentaiko-simmered sardines) 12 fish / 手羽先明太 (chicken wings with mentaiko) 10 pieces / 手羽先餃子 (chicken wing gyoza) 10 pieces. This article organizes what is stated for the 1kg main item without a bonus item; the contents and ingredients of the bonus items are outside its scopeSource: same as above (as of viewing on September 30, 2026) |
| Storage method | Frozen. Storage temperature: not confirmedSource: Rakuten Ichiba product page (as shown in the product name) |
| Best-before date | Within 180 days if kept frozen (within 60 days recommended), and within 10 days refrigerated after thawing. A best-before date of 180 days from the shipping date is labeled, but because a home freezer runs at a higher temperature than a commercial one, the page advises eating it as soon as possibleSource: Rakuten Ichiba product page, product description |
| Country of origin (raw materials) | Walleye pollock ovaries (Russia or the United States)Source: same as above |
| Place of processing | Fukuoka (an image on the product page says everything is manufactured in Fukuoka, and the manufacturer is also located in Fukuoka Prefecture)Source: Rakuten Ichiba product page (product description and images on the page) |
| Condition / how to eat (heating required?) | The product description gives examples of using it in pasta, rice balls (onigiri), tamagoyaki (rolled omelet), and so on. We could not find any guidance on whether it can be eaten raw or whether heating is requiredSource: Rakuten Ichiba product page, product description |
| Thawing method | As an example of thawing, the page says to thaw only the amount you need slowly in the refrigerator for 24 hours. Whether it can be refrozen and how to portion it: not confirmedSource: same as above |
| Reason for the discount (wakeari) | The page says it is packed with mentaiko whose roe broke or that was cut into small pieces during production. It also says the contents may arrive in various conditions, such as many loose roe eggs (bara-ko) or very small cut pieces, and that the photo is an illustrationSource: image on the Rakuten Ichiba product page |
| Shipping | Delivered by Yamato Transport. Shipping is estimated within 2–3 days (excluding the shop’s closed days; as displayed on September 30, 2026). An image on the page explains that it arrives in a styrofoam (expanded polystyrene) boxSource: Rakuten Ichiba product page (product description and images on the page) |
| Manufacturer | 株式会社 博多ふくいち (Shingu Town, Kasuya District, Fukuoka Prefecture)Source: Rakuten Ichiba product page, product description |
| Shop | 辛子明太子専門店 博多 うまみ堂 (Rakuten Ichiba). The seller is 株式会社うまみ (Hakata Ward, Fukuoka City, Fukuoka Prefecture)Source: Rakuten Ichiba company information page (viewed September 30, 2026) |
Prices are not listed here because they change. Please check the current price and stock availability at the link above.
Ingredients and Allergen Labeling
The ingredients field of the Rakuten Ichiba product description (viewed September 30, 2026) reads as follows.
Walleye pollock ovaries (Russia or the United States), fermented seasoning, salt, soy sauce, chili pepper, bonito-flavored seasoning, seasoning (amino acids, etc.), sweetener (sorbitol), antioxidant (vitamin C), niacin, enzyme, color-developing agent (sodium nitrite) (part of the ingredients contain wheat and soybeans)
The only allergen statement is wheat and soybeans at the end of this ingredients field. We could not find a separate field on Rakuten’s product page that shows allergies or specified ingredients. The same shop’s two product pages on Amazon list the ingredients in the same order and also say they contain wheat and soybeans (only the order of the origin differs: on Amazon it is the United States or Russia). The statements in the three places do not conflict as far as allergens are concerned.
If you have an allergy, please check the shop’s listing before buying, and the food information label on the product once it arrives.
Reference: Consumer Affairs Agency, Japan, “About Allergen Labeling” (accessed September 30, 2026)
Five Things to Check Before Buying
| Point to check | For this product | Source |
|---|---|---|
| 1. Amount & servings | 1kg. Number of servings: not confirmed | Shown in the name on the product page. No number of servings is stated |
| 2. Storage & shelf life | Frozen. Best-before date is within 180 days if kept frozen (within 60 days recommended), and within 10 days refrigerated after thawing | Rakuten Ichiba product page, product description |
| 3. Ingredients & allergen labeling | Stated to contain wheat and soybeans in part of the ingredients | Ingredients field of the Rakuten Ichiba product description (the same shop’s Amazon product pages state the same) |
| 4. Suitable as a gift? | Stated as not supporting noshi (gift-wrapping label). A statement to the effect that it is also recommended for gifts and a statement to the effect that it is for home use and not suitable as a gift both appear on the product page | Product description and images on the product page |
| 5. Review trends | The Rakuten Ichiba rating is 4.59 / 5 (2,604 reviews). Trends by theme are in the “What Public Reviews Say” section (120 reviews read in total; may not reflect the product’s current condition) | Rakuten customer reviews (“Minna no Review”) (viewed September 30, 2026) |
Suitable as a Gift?
What we could confirm from the product page is as follows (viewed September 30, 2026).
- Noshi: the product description says it cannot be supported, and an image on the product page also labels it as an item without noshi support. Because noshi is not supported, the types of inscription (such as oseibo, year-end gifts) do not apply
- Gift wrapping, message cards, and name printing: could not be confirmed
- If ordered as a gift: the page says the orderer’s information appears in the sender field, the shop’s information is not printed on the shipping slip, no statement showing the amount is included, and only the serving instructions are enclosed
- Conflicting statements: the beginning of the product description has a sentence to the effect that it is also recommended for gifts. On the other hand, the same description says it is sold for home use and does not support noshi, and images on the product page also say to use it at home and that, unlike whole-piece mentaiko (“一本物”), it is not suitable as a gift
Because the product page’s statements are split in this way, this article does not position this product as suited to gifts. If you are considering it as a gift, please also consider the points above, as well as that it is a frozen item and whether the recipient has freezer space for 1kg.
Rakuten customer reviews (“Minna no Review”) also included posts saying it was bought as a gift and was well received (we read the first 60 reviews in the default order and 30 each filtered to 1★ and 2★, 120 in total. The posts date from February 2019 to September 2026, and the latest is from September 2026. This trend may not reflect the product’s current condition. Details are in the “What Public Reviews Say” section).
What Public Reviews Say
We organized the Rakuten Ichiba product reviews by theme. Rating figures are as of viewing and change afterward.
| Site | Rating | Reviews | Viewed |
|---|---|---|---|
| Rakuten customer reviews (product page) | 4.59 / 5 | 2,604 | September 30, 2026 |
Rating breakdown: 5★ 1,879 / 4★ 524 / 3★ 103 / 2★ 61 / 1★ 37 (as shown on Rakuten Ichiba, viewed September 30, 2026)
What we read: the first 60 reviews in Rakuten’s default order (posted November 2025 to September 2026; latest September 2026), plus 30 each filtered to 1★ and 2★ (posted February 2019 to July 2026), 120 in total. These are trends within what we read and may not reflect the product’s current condition.
What Reviewers Praise
Spiciness and saltiness
14 of the first 60 reviews in the default order said the spiciness and saltiness were just right or suited their taste. Some also mentioned that it is uncolored. How spiciness and saltiness are perceived differs by writer, and among the 60 reviews at 1★ and 2★, 8 said it was salty or spicy (1 of them from the last two years).
Ease of use in cooking
20 of the first 60 reviews in the default order said they used it in pasta, as an onigiri (rice ball) filling, in tamagoyaki and dashimaki (rolled omelets), in udon, in fried rice, and so on.
Convenience of the small pieces and portioning
20 reviews said that because the pieces are small, it is easy to take out just the amount they need, or that they split it into small bags after it arrived and froze it. Some also mention that bags for portioning were included, but this is a purchaser’s description and we have not verified it as something the shop states.
Amount and satisfaction
11 reviews said the 1kg amount is large and they were satisfied (including reviews that mention the price). Prices change, so this article does not state them.
Source: Rakuten customer reviews (viewed September 30, 2026)
What Reviewers Note
Wateriness and grain texture after thawing
13 of the 60 reviews at 1★ and 2★ (5 of them posted within the last two years) said it felt watery after thawing, released drip, or had a weak popping texture of the grains.
How to check: The thawing example the shop provides is summarized in the “Thawing method” row of this article’s “Basic Information” section.
Condition on arrival
11 of the 60 reviews at 1★ and 2★ (2 of them posted within the last two years) said it was supposed to arrive frozen but arrived thawed or partly thawed. The posts span August 2020 to July 2026.
How to check: That it is a frozen item and that the page says it is delivered by Yamato Transport are summarized in the “Storage method” and “Shipping” rows of this article’s “Basic Information” section.
Variation in the shape and condition of the small pieces
10 of the 60 reviews at 1★ and 2★ (3 of them posted within the last two years) said the condition of the small pieces varied, for example pieces that had lost their shape or many loose roe eggs (bara-ko).
How to check: The reason for the discount that the shop gives is summarized in the “Reason for the discount (wakeari)” row of this article’s “Basic Information” section.
Source: Rakuten customer reviews (viewed September 30, 2026)
Who It Suits / Who Should Be Careful
Who It Suits
- Looking for mentaiko to mix into dishes such as pasta, rice balls, and tamagoyaki
- Fine with pieces that have been cut small
- Able to portion it and keep it in the freezer
- Have room in the freezer for 1kg
Who Should Be Careful
- Have a wheat or soybean allergy (stated to be contained in part of the ingredients)
- Want guidance on whether it can be eaten raw or needs heating (we could not find any)
- Want to use it as a gift with noshi attached (noshi not supported)
- Put weight on a consistent grain texture and shape
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is September 30, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
*The Amazon link goes to the same store’s item in different specifications (Amazon: a choice of 1kg × 1 box or 1kg × 2 boxes; Rakuten Ichiba: 1kg combined with a selectable bonus item). The amount and contents in this article are based on the Rakuten Ichiba item. Please check the details on the Amazon product page before purchasing.
Summary
- A frozen 1kg item that the page describes as a wakeari product packed with mentaiko whose roe broke or that was cut into small pieces. Number of servings: not confirmed
- According to the product page, the best-before date is within 180 days if kept frozen (within 60 days recommended) and within 10 days refrigerated after thawing. We could not find guidance on eating it raw versus heated, or on whether it can be refrozen
- Part of the ingredients contain wheat and soybeans. Noshi is not supported, and the product page has both a statement recommending it for gifts and a statement that it is for home use, so care is needed when giving it as a gift
Related Pages
This article organizes information published on sales sites and review sites. Product information such as amount, storage method, and ingredients may change. Please check the seller’s listing for the latest information.
Comments on taste or quality are summarized from third-party posts cited with their source, and are not Ochinity’s own evaluation. Our approach to writing articles is described in our Editorial Policy.
Information as of: September 30, 2026 / Sources: Rakuten Ichiba “辛子明太子専門店 博多 うまみ堂” product page and company information page, the same shop’s product pages on Amazon, Rakuten customer reviews, Consumer Affairs Agency, Japan, “About Allergen Labeling”
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