{"id":115975,"title":"Authentic Daigaku-imo \u2013 Candied Sweet Potatoes","modified":"2026-03-03T10:58:22+01:00","plain":"Double-fried Japanese sweet potatoes, glazed with a mirin\u2013soy syrup and finished with black sesame for an irresistible crisp-outside, tender-inside bite.\n\n\n\nUnder the warm glow of street stalls, big wedges of sweet potato gleam beneath a glossy amber coat. The thin crust gives way with a clean crackle. A puff of steam rises from the split, fluffy flesh\u2014sweet, honeyed, and gently chestnut-like. \n\n\n\nA sticky yet supple glaze clings to the edges. Each bite balances a delicate crunch with the nutty snap of toasted black sesame. According to a widely repeated origin story, a vendor named Mikawaya\u2014set up near the Akamon (Red Gate) of the University of Tokyo\u2014introduced it, and students made it famous. \n\n\n\nToday, Daigaku\u2011imo shows up at festivals (alongside okonomiyaki or yakisoba), in department-store food halls\u2014where katsu sando and tamago sando are beloved\u2014and in home kitchens. \n\n\n\nDaigaku-imo: what is it?\n\n\n\nDaigaku\u2011imo (\u5927\u5b66\u828b), literally \u201cuniversity potatoes,\u201d takes its name from early 20th\u2011century student life around the Akamon (Red Gate) of the University of Tokyo, where filling, affordable sweets helped students refuel between classes. \n\n\n\nAt the heart of the dish are Japanese sweet potatoes, cut into rustic chunks with the skin left on. They\u2019re fried, coated in a shiny sugar syrup, then sprinkled with toasted black sesame. Serve them at room temperature or slightly warm (like mitarashi dango or zaru soba).\n\n\n\nThe famous mitarashi dango\n\n\n\nAuthentic versions use satsumaimo varieties like Naruto Kintoki or Beniazuma for a light, naturally sweet interior. The syrup is simple: sugar and a splash of water, with a subtle touch of soy sauce. Of course, you can use what you have\u2014but these varieties really do make a difference.\n\n\n\nOptionally, mirin or a starch\/malt syrup (mizuame) adds shine and stability. The hallmark texture is \u201ccrispy outside, tender inside,\u201d with a thin, even glaze that clings without turning brittle. \n\n\n\nEqually telling are what you leave out: no breading before frying, no butter, and no heavy-handed spices. In Kant\u014d, the coating stays slightly sticky and supple, with sesame sprinkled over the top; in Kansai, its relative \u201cCh\u016bka poteito\u201d (here \u201cch\u016bka\u201d refers to Sino\u2011Japanese dishes like tantanmen) leans toward a firmer caramel shell. These differences reflect how the dish spread over time.\n\n\n\nMy tantanmen recipe\n\n\n\nThe origins of Daigaku-Imo\n\n\n\nMost Tokyo accounts point to the Taish\u014d to early Sh\u014dwa years (1910s\u20131930s), when a vendor named Mikawaya set up near the Akamon of the University of Tokyo and began selling fried sweet potato pieces glazed in a sugar syrup. \n\n\n\nCheap, piping hot, and satisfying, the snack became a symbol of student life\u2014and gave the dish its name. The idea likely traces back to a candied sweet potato recipe published in a Chinese cookbook in 1912 (fried in lard, then simmered in sugar, originally without sesame), later adapted in Japan into a national favorite.\n\n\n\nIts identity is distinctly Kant\u014d. In Asakusa, Chibaya still sells wedges with crisp edges and a very sweet glaze, often sold out by late morning; Aji no Ry\u014dsabur\u014d in Tait\u014d carries on the Mikawaya style, now in its third generation. \n\n\n\nBut Daigaku\u2011imo lives well beyond nostalgia shops: it\u2019s a home-cooking staple (like katsudon, oyakodon, or butadon), sometimes served in school cafeterias (alongside Japanese curry, katsu curry, or omurice) and, in sweet-potato-rich Ibaraki, even offered as a side dish. \n\n\n\nIn Kansai, the cousin \u201cCh\u016bka poteito\u201d keeps more of its Chinese profile, favoring a thicker caramel that sets into a brittle shell. In other words, authenticity comes down to ingredients and technique\u2014not just origin stories.\n\n\n\nThe main ingredients for daigaku-imo\n\n\n\n\n\n\n\n\nJapanese sweet potatoes (satsumaimo): Varieties like Naruto Kintoki or Beniazuma cook up tender and sweet, with the red\u2011purple skin left on for aroma, color contrast, and to help the pieces hold together.\n\n\n\nNeutral frying oil: A neutral oil that handles high heat, crisping the surface without masking the sweet potato\u2019s delicate flavor; traditionally, light vegetable oils are used.\n\n\n\nSugar: The base of the glaze, cooked to a light-to-medium amber for subtle bitterness and shine; semi\u2011refined sanont\u014d adds a rounder sweetness, also found in dorayaki.\n\n\n\nWater: Dissolves the sugar and manages caramelization so the syrup coats in a thin, even layer instead of seizing and crystallizing.\n\n\n\nMizuame (starch\/malt syrup), optional: Adds clarity and helps prevent gritty crystallization, reinforcing that signature glassy shine.\n\n\n\nSoy sauce (a tiny touch): A quiet seasoning that lifts the sweetness without taking over; you taste the balance, not the soy.\n\n\n\nMirin, optional: Adds gloss, a gentle aroma, and a soft, rounded sweetness in the wagashi tradition.\n\n\n\nVinegar or lemon juice, optional: A few drops of acid help keep the syrup flexible and prevent a brittle shell.\n\n\n\nBlack sesame seeds (toasted): Kant\u014d\u2019s signature: nutty aroma, a light crunch, and striking contrast against amber potatoes; as in goma dare sauce.\n\n\n\nSalt (a pinch, optional): A finishing touch that brightens and highlights the sweetness without turning the dish savory.\n\n\n\n\nRegional styles\n\n\n\nIn Tokyo and the rest of Kant\u014d, Daigaku\u2011imo is finished with a slightly looser, stickier glaze and a shower of black sesame. \n\n\n\nKansai\u2019s \u201cCh\u016bka poteito,\u201d closer to its Chinese candied roots, leans toward a hard, crunchy caramel. Purists point to clear markers: fried pieces without breading, a glaze that\u2019s mostly sugar with a small touch of soy sauce, mirin or mizuame optional for shine, and sesame to finish. \n\n\n\nDaigaku\u2011imo is best enjoyed warm or at room temperature. After glazing, spread the pieces out and eat them promptly so they don\u2019t stick together.\n\n\n\nAuthenticity comes down to technique: many cooks recommend double frying for the contrast of a crisp shell and a fluffy center, and add a few drops of acid to the syrup to keep it supple. \n\n\n\nPurists also argue that modern shortcuts (skipping the soy sauce or mirin, or leaning too heavily on honey or corn syrup) dull the dish\u2019s characteristic sweet-salty balance. From Asakusa institutions to school cafeterias, it\u2019s a living classic (like mochi): simple on paper, but the balance of the glaze\u2014and the timing\u2014will test your touch.\n\n\n\n\n\n\tAuthentic Daigaku-imo (Caramelized Sweet Potatoes)\n\t\t\n\t\t\t\n\t\n\t\t\t\n\t\n\t\t500 g Japanese sweet potatoes (about 2 medium potatoes, yellow-fleshed)neutral vegetable oil (for frying (2\u20133 cm depth in the pan))40 g granulated sugar1 tablespoon mirin2 teaspoons light soy sauce1 tablespoon water2 tablespoons black sesame seeds (toasted)\t\n\t\n\t\tPrep the sweet potatoesCut the sweet potatoes (skin on) into irregular, bite-size chunks.Soak the pieces in water for 5 minutes. Drain well in a colander, then pat completely dry to remove excess moisture.Double-fryPour the vegetable oil into a deep skillet to a depth of 2\u20133 cm and heat to 130\u2013140 \u00b0C.Add the sweet potatoes and fry for about 5 minutes, turning occasionally. Remove and let rest for 3 minutes.Increase the oil temperature to 170\u2013180 \u00b0C. Return the sweet potatoes to the pan and fry for 1\u20132 minutes. Remove and drain.Make the syrup and coatAdd the sugar, mirin, soy sauce, and water to a wok and heat. When the mixture comes to a boil, add the sweet potatoes and toss to coat for about 30 seconds.Turn off the heat, add the black sesame seeds, and toss once more. Serve immediately.\t\n\t\n\t\tTip: Use the smallest amount of syrup possible\u2014just enough to coat\u2014so the sweet potato flavor really shines.\nWhy double-fry: It creates pieces with a satisfying bite and a tender, fluffy center.\nUse enough oil for even frying. Letting the potatoes rest for about 3 minutes between fries helps the heat reach the center without overcooking the outside.\n\t\n\t\n\t\tDessertJaponaise\t\n\n\n\n\n\nCulinary sources\n\n\n\n\u2022 Daigaku Imo (Japanese sweet potato dessert) \u2013 Chef JA Cooks (English) (Chef JA Cooks)\u2022 Daigaku Imo: the sweet potato with a college education \u2013 Steve Beimel (English) \u2022 Daigaku Imo \u2013 Etymology, origin and recommended recipe \u2013 Food in Japan (English) (Food in Japan)\u2022 Basic knowledge about daigaku-imo (Japanese) (\u5927\u5b66\u828b \u65e5\u672c\u30fb\u5927\u5b66\u828b\u611b\u5354\u4f1a)\u2022 Daigaku-imo: a \u201cUniversity of Tokyo\u201d origin? \u2013 J\u30bf\u30a6\u30f3\u30cd\u30c3\u30c8 (Japanese) (J\u30bf\u30a6\u30f3\u30cd\u30c3\u30c8)\u2022 What is the origin of daigaku-imo? \u2013 \u4e94\u5cf6\u5546\u5e97 \u4f50\u85e4\u306e\u828b\u5c4b (Japanese) (\u4e94\u5cf6\u5546\u5e97 \u4f50\u85e4\u306e\u828b\u5c4b)\u2022 Daigaku-imo \u2013 Wikipedia (Japanese) (ja.wikipedia.org)\u2022 Daigaku-imo made with maltose syrup \u2013 Delish Kitchen (Japanese) (\u30c7\u30ea\u30c3\u30b7\u30e5\u30ad\u30c3\u30c1\u30f3)\u2022 Recipe: fried sweet potatoes (sweet and savory) \u2013 The Japan Times (English) (japantimes.co.jp)\u2022 Daigaku Imo (\u5927\u5b66\u828b) \u2013 r\/JapaneseFood \u2013 Reddit (English) (Reddit)\u2022 I made daigaku imo! \u2013 r\/JapaneseFood \u2013 Reddit (English) (Reddit)\u2022 Daigaku-imo \u2013 Recipe overview \u2013 \u8fbb\u8abf\u304a\u3044\u3057\u3044\u30cd\u30c3\u30c8 (Japanese) (\u8fbb\u8abf\u30b0\u30eb\u30fc\u30d7)\u2022 Candied sweet potatoes (daigaku-imo) \u2013 Just One Cookbook (English) (Just One Cookbook)\u2022 Daigaku-imo without sugar or reduction: a beautifully pourable syrup \u2013 FOODIE (Japanese) (mi-journey.jp)","_links":{"self":[{"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/posts\/115975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/comments?post=115975"}],"version-history":[{"count":0,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/posts\/115975\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/media\/115708"}],"wp:attachment":[{"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/media?parent=115975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/categories?post=115975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/marcwiner.com\/en\/wp-json\/wp\/v2\/tags?post=115975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}