Ingenmame (Kidney Beans)

Ingenmame is Phaseolus vulgaris, the common bean of global agriculture, with multiple cultivar categories serving distinct Japanese culinary purposes. Major Japanese cultivars include: (1) Kintoki-mame (金時豆) — red kidney bean, the volume retail cultivar for traditional Japanese bean dishes including nimame and konbu-maki (kombu-rolled beans). (2) Shiro-ingen / Daifuku-mame (白いんげん / 大福豆) — large white kidney bean, the premium choice for shiro-an (white bean paste) production. The lighter color is essential for wagashi where a paler filling is desired. (3) Tora-mame (虎豆) — tiger-striped bean with distinctive markings, premium nimame and visual presentation. (4) Uzura-mame (うずら豆) — quail-pattern speckled bean, premium nimame.

Nutritionally, dry kintoki-mame per 100g provides 280 kcal, 19.9g protein, 2.5g fat, 56.4g carbohydrates with 19.6g dietary fiber (very high). Mineral content includes K 1500mg (very high), Mg 150mg, P 430mg, Fe 5.4mg per 100g. Saponin and polyphenol content provides functional positioning options.

Industrial supply: Hokkaido dominates with the Tokachi region as the production heartland. Annual production by cultivar varies — kintoki-mame is the volume leader, with shiro-ingen positioned as premium specialty. Domestic vs imported (Argentina, China, USA, Canada) origin disclosure is increasingly important for premium positioning.

Food safety: raw or undercooked white kidney beans (and to lesser extent other Phaseolus vulgaris cultivars) contain phytohaemagglutinin, a lectin that causes severe digestive upset. Proper cooking (boiling for at least 30 minutes) eliminates the toxin. This affects retail product positioning — only cooked/pre-cooked retail products are appropriate; dry beans require consumer awareness of proper preparation.

Nimame (煮豆) — sweet-simmered beans cooked with sugar and soy sauce. Kintoki-mame nimame, tora-mame nimame, and uzura-mame nimame are all established retail categories (canned, pouched, or as part of bento). Otsuyu-mame and konbu-maki are related preparations.

Shiro-an (白あん) — white bean paste produced from shiro-ingen / daifuku-mame, used as filling for premium wagashi where lighter color is desired (white-color manju, namagashi, monaka, premium yokan). The premium shiro-an position is parallel to azuki anko but for paler-color products.

Wagashi production — shiro-an-based wagashi forms a major branch of Japanese confectionery. Regional and seasonal namagashi, premium manju, and traditional pastry production all use shiro-ingen extensively.

Western-influenced applications — Japanese-style chili (with Japanese seasoning), soup beans, bean salad, and other Western-influenced bean dishes use kidney beans broadly.

School lunch staple — bean dishes are common in Japanese school lunch (kyu-shoku) programs, with nimame and bean salad being established components.

Premium gift retail — Hokkaido Tokachi specialty bean gift sets (kintoki, shiro-ingen, tora-mame, uzura-mame variety packs) are an established premium gift category.

For OEM: dry retail bean packs (with cultivar specification), pre-cooked nimame retail (canned/pouched, sweet-simmered or savory), shiro-an production for wagashi makers (cooked from shiro-ingen / daifuku-mame), pre-cooked white kidney beans for Western bean dish applications, and premium gift retail formulations.

Standard agricultural product labeling. Hokkaido Tokachi domestic origin disclosure essential for premium positioning. Cultivar disclosure (kintoki / shiro-ingen / tora-mame / uzura-mame) supports differentiation.

Imported (Argentina, China, USA, Canada) vs domestic Japan origin should be clearly disclosed.

Phytohaemagglutinin food safety: dry retail products should include preparation instructions for proper cooking. Pre-cooked retail products eliminate this concern.

Ingenmame is not a designated JAS allergen, but legume oral allergy syndrome reactions are documented.