Daifuku — soft mochi rounds filled with red-bean paste

i. Origin & history

Daifuku grew out of a cheap, filling street snack of the Edo period. An early form was known as harabuto mochi, 'fat-belly mochi' — a large, rather plain rice cake stuffed with salted bean paste that sat heavily in the stomach. It was later called daifuku mochi with characters meaning 'big belly' (大腹), and at some point in the eighteenth century, by the usual account, the sweeter version took the homophone 大福, 'great fortune', a name far better suited to selling.

By the late Edo period daifuku were sold hot from grills in the streets of Edo as a winter snack, and the auspicious name made them a gift for celebrations and New Year. Over the following century the filling became sweeter and the mochi thinner and finer, and daifuku settled into the form now sold everywhere: a palm-sized round, its smooth top showing faintly the dark paste beneath.

The great modern addition is ichigo daifuku, strawberry daifuku, which appeared in the 1980s. Several Tokyo confectioners claim to have made it first, and the question has never been settled; what is certain is how quickly it spread, becoming a fixture of the winter and spring strawberry season and one of the few new wagashi to enter the permanent repertoire.

Daifuku sits within a large family of filled rice cakes. Mochi is the general term for the pounded glutinous-rice cake itself; daifuku is a specific filled sweet made from it. Red-bean mochi as it is often sold outside Japan is usually daifuku by another name, and mochi ice cream is a modern descendant that swaps the bean paste for ice cream.

ii. What makes mochi stretch — and why it hardens

The dough is made from glutinous rice, which despite the name contains no gluten. It is called glutinous because it becomes sticky, and that stickiness comes from its starch: glutinous rice is almost pure amylopectin, a highly branched starch molecule, with very little of the straight-chained amylose found in ordinary rice. When it is cooked in water, the amylopectin swells into a stretchy, elastic, glossy gel — the characteristic pull of mochi.

Traditionally that gel is made by steaming whole glutinous rice and pounding it. At home, glutinous-rice flour does the same job. Shiratamako, made from wet-milled rice, gives the smoothest and most elastic result; mochiko, a finer dry-milled flour, is easier to find and gives a slightly softer, less springy mochi. Both work, and both need to be fully cooked: raw spots are chalky and do not stretch.

Sugar is part of the structure, not just the sweetness. Sugar holds water and slows down retrogradation, the process by which cooked starch molecules realign as they cool and squeeze out water. Retrogradation is what turns soft mochi hard and dry within a day, and it happens fastest at fridge temperature. A sweetened mochi dough stays soft for longer than plain mochi, which is why daifuku dough always contains sugar.

The potato starch dusting (katakuriko) keeps the sticky surface from bonding to hands, boards and other daifuku. Use only as much as you need — the starch is raw and tastes chalky in thick layers — and brush the excess off before serving.

iii. Ingredients

Makes 8 servings · scroll the side panel to adjust

• 240 g sweet red-bean paste (koshian or tsubuan)
• 150 g shiratamako or mochiko (glutinous-rice flour)
• 60 g caster sugar
• 180 ml water
• 40 g potato starch (katakuriko) or cornflour, for dusting

The flour must be glutinous-rice flour — labelled shiratamako, mochiko, sweet rice flour or glutinous rice flour. Ordinary rice flour will not make mochi; it sets into a soft paste with no stretch. For the filling, koshian (smooth paste) is the classic for a refined daifuku and tsubuan (chunky paste with whole beans) for a homely one; ready-made anko from a Japanese grocer is perfectly standard. It should be stiff enough to roll into balls. Potato starch is the traditional dusting because it is very fine and neutral; cornflour is an acceptable substitute, and toasted soybean flour (kinako) is used for some varieties.

iv. Method

1. Divide the bean paste into 8 portions of 30 g, roll each into a ball and set them on a plate. Chill for 15 minutes so they are firm and easy to wrap.
2. Whisk the glutinous-rice flour and sugar in a large microwave-safe bowl, then whisk in the water a little at a time until completely smooth and the consistency of thick cream.
3. Cover loosely and microwave on full power (about 800 W) for 1 minute. Stir hard with a wet spatula — the edges will have started to set.
4. Microwave for another 1 minute and stir again, then a final 30–60 seconds. The dough is ready when it is translucent all through, glossy and stretches in long ropes from the spatula, with no white opaque patches.
5. Dust a tray generously with potato starch. Scrape the hot mochi onto it, dust the top and let it cool for 2–3 minutes until it can be handled.
6. With starch-dusted hands, divide the mochi into 8 pieces. Flatten each into a 9 cm round, a little thinner at the edges than in the centre.
7. Set a ball of paste in the centre, then stretch and pinch the mochi up and around it, sealing at the top. Turn seam-side down, cup into a neat round and brush off the excess starch. Serve within a few hours.

v. Tips & common mistakes

• Chill the filling, not the mochi. Firm paste balls are far easier to wrap, while the mochi should be used warm, when it is most pliable.
• Cook until no white remains. Under-cooked mochi tears when stretched and has a raw, floury taste. Give it another 20–30 seconds if any opaque patches remain.
• Keep the edges thin. When you pinch the mochi closed, the edges bunch up at the seam. Thinning them first stops a thick, doughy knot forming on the base.
• Wet the spatula, starch the hands. Water keeps mochi from sticking to tools while it cooks; starch is what stops it sticking to you when shaping.
• Do not refrigerate finished daifuku. The cold sets the starch in hours and the mochi turns hard and crumbly.
• Make them on the day. Daifuku are at their softest within a few hours of making; plan to make them close to serving.

vi. Variations

Ichigo daifuku wraps a hulled strawberry in a thin layer of bean paste (often white bean paste) and then in mochi; it is sometimes cut in half to show the cross-section. Mame daifuku folds salted, cooked black soybeans or red peas into the mochi, so the sweet paste is offset by little savoury bursts. Yomogi daifuku, also called kusa daifuku, is coloured and scented with mugwort and is a spring sweet. Shio daifuku adds salt to the mochi. Modern variants include cream daifuku, filled with whipped cream and bean paste, fruit daifuku with grapes, mandarins or kiwi, and matcha daifuku.

The same idea of a soft rice dough around a sweet filling is shared across East Asia, from Chinese tangyuan (filled glutinous-rice balls served in syrup) to the Indonesian palm-sugar klepon. Within wagashi, monaka holds the same bean paste in crisp wafers, and kuzumochi uses kudzu starch rather than rice.

vii. Serving & storage

Serve daifuku at room temperature with green tea — sencha, hojicha or matcha, whose bitterness balances the sweetness. Eat them with your fingers or cut them with a wooden pick; they are sweet and dense, and one or two per person is ample.

They are best on the day they are made. Wrapped individually in cling film, they keep for up to 2 days at cool room temperature, firming gradually. Do not refrigerate them unless they contain cream or fruit, and then eat them within a day. For longer storage, wrap individually and freeze for up to a month; thaw at room temperature for 1–2 hours, and the texture returns surprisingly well.

ix. More from Japanese

• Mochi — the pounded rice cake itself
• Red Bean Mochi — anko-stuffed rice cakes
• Mochi Ice Cream — ice cream in a mochi skin
• Monaka — crisp wafers with bean paste
• Mitarashi Dango — glazed rice dumplings
• Tangyuan — Chinese filled rice balls