Mochi Rice Balls — ohagi, half-pounded sticky rice with red-bean paste

i. Origin & history

Ohagi are tied to the Buddhist observance of higan, the week around each equinox when the boundary between this world and the next is said to be thinnest. Families clean their ancestors' graves, offer food at the household altar and share sweets, and ohagi are the classic offering. The red of azuki beans was traditionally believed to ward off evil, which helps explain their place at rituals.

The two common names are seasonal. In spring, when peonies (botan) bloom, the sweets are called botamochi — 'peony mochi' — and are often large and round like the flower. In autumn they are ohagi, after the bush clover (hagi) that flowers then, and are smaller and more oval, like its leaves. Some say that the coarse, chunky tsubuan paste of autumn reflects the freshly harvested beans with tender skins, and that the smooth koshian of spring reflects the older, tougher beans that are better sieved. In practice regional and family usage varies widely, and many shops use 'ohagi' all year.

There are also playful names for summer and winter: yofune ('night boat') and kitamado ('north window'). The jokes turn on the word tsuki, which can mean pounding, arriving or the moon. Because ohagi is made without the loud pounding of ordinary mochi, nobody can tell when the night boat has 'arrived', and no 'moon' is visible through a north-facing window. They are usually repeated as wordplay rather than names anyone uses.

Ohagi are often confused with daifuku, and many shops outside Japan sell both as 'mochi'. The difference is the rice. Daifuku uses fully pounded mochi or glutinous-rice-flour dough wrapped thinly around bean paste. Ohagi uses whole rice grains, steamed and only roughly mashed, and is usually coated in paste rather than wrapped in dough.

ii. Why the rice is only half pounded

The texture of ohagi depends on the Japanese technique called hangoroshi — literally 'half-killing' the rice. The cooked rice is mashed with a wet pestle or rolling pin just until about half the grains have broken down. The broken grains release enough sticky starch to bind the ball together, while the remaining whole grains give it a soft, slightly nubbly bite. Pound it fully and you have mochi; do not pound it at all and the balls fall apart.

The binding power comes from amylopectin, the branched starch that makes glutinous rice sticky. Many cooks blend glutinous rice with a portion of ordinary short-grain rice, often in a ratio of about three to one. The ordinary rice, with more amylose, makes the balls less sticky and gives a lighter texture that stays soft longer; all glutinous rice gives a chewier, denser ball.

The rice is cooked with only a little salt and sugar, if any. The paste supplies sweetness, and a small amount of salt in both rice and paste brings the flavours together. Shaping is done while the rice is warm and pliable, with wet hands so that it does not stick, and the bean paste is used at room temperature so that it spreads easily without tearing the rice.

iii. Ingredients

Makes 12 servings · scroll the side panel to adjust

• 225 g glutinous (sweet) rice
• 75 g Japanese short-grain rice
• 360 ml water
• ¼ tsp salt
• 1 tbsp caster sugar (optional)
• 400 g sweet red-bean paste (tsubuan or koshian)
• 25 g kinako (roasted soybean flour)
• 25 g black sesame seeds, toasted and ground
• 2 tbsp caster sugar, for the coatings
• ⅛ tsp salt, for the coatings

The rice blend is the key choice: glutinous rice alone makes stickier, chewier ohagi, while adding ordinary Japanese short-grain rice gives a lighter, softer texture. Ready-made red-bean paste from a Japanese grocer is standard in many homes; tsubuan (chunky) is traditional for autumn ohagi and koshian (smooth) for spring botamochi, but either is fine. Kinako has a nutty, toasty flavour; mix it with sugar and a pinch of salt for the classic coating. For the sesame, toast black or white seeds until fragrant and grind them coarsely, then mix with sugar.

iv. Method

1. Wash both rices together until the water runs fairly clear, then soak in the 360 ml water for at least 2 hours, or overnight.
2. Add the salt and cook in a rice cooker, or in a covered pan: bring to the boil, then cook over the lowest heat for 15 minutes, turn off the heat and leave covered for 10 minutes.
3. While the rice is hot, sprinkle over the sugar if using, then mash it in the pan with a wet wooden pestle or rolling pin until about half the grains are broken and the rice is sticky but still grainy.
4. Divide the bean paste: 6 portions of 45 g for the paste-coated ohagi, and 6 portions of 20 g for the filled ones. Roll each into a ball.
5. With wet hands, divide the rice into 6 balls of about 40 g and 6 balls of about 60 g. For the paste-coated ohagi, flatten a 45 g portion of paste on a damp cloth or cling film, set a 40 g rice ball in the centre and use the cloth to wrap the paste around the rice, smoothing it into an oval.
6. For the coated ohagi, flatten each 60 g rice portion in your palm, put a 20 g ball of paste in the centre and close the rice around it, forming an oval.
7. Mix the kinako with half the sugar and a little salt, and the ground sesame with the remaining sugar. Roll three of the filled ohagi in kinako and three in sesame, pressing lightly so the coating sticks.

v. Tips & common mistakes

• Stop pounding at half. Some whole grains should be visible; that rough texture is what makes ohagi different from mochi.
• Work while the rice is warm. Cooled rice loses its stickiness and will not hold together around the filling.
• Keep a bowl of water nearby. Dip your hands and tools frequently so the rice does not stick.
• Use a damp cloth or cling film for paste-covered ohagi. It makes it easy to wrap the paste evenly around the rice without tearing it.
• Season the coatings. Kinako and sesame taste flat without sugar and a pinch of salt.
• Do not refrigerate. The rice hardens quickly in the cold; ohagi are meant to be eaten on the day.

vi. Variations

The three classic coatings are red-bean paste, kinako and sesame. Other traditional versions include zunda ohagi from the Sendai area, covered in sweet mashed edamame paste, and aonori ohagi, rolled in seaweed flakes. Modern shops make ohagi in seasonal colours with matcha, pumpkin, sweet potato or black sesame paste, and small, colourful 'ohagi boxes' are a recent trend.

Other Japanese sweets made from glutinous rice include the smooth, filled daifuku, the skewered mitarashi dango and zenzai, in which mochi floats in sweet bean soup. Elsewhere in Asia, the Chinese tangyuan and Indonesian klepon are filled glutinous-rice balls, and Korea's yaksik is a sweet, spiced sticky-rice cake.

vii. Serving & storage

Serve ohagi at room temperature with green tea, as an afternoon sweet or a gift for the equinox. In Japanese homes, a plate is first placed at the family altar as an offering and then shared. Two pieces per person is ample.

They are best on the day they are made. Wrapped in cling film, they keep at cool room temperature until the next day. If refrigerated, the rice turns hard; warm briefly in a microwave for 10–15 seconds to soften it. They can be frozen, tightly wrapped, for up to 2 weeks, and thawed at room temperature.

ix. More from Japanese

• Daifuku — smooth mochi with bean filling
• Mochi — the pounded rice cake
• Mitarashi Dango — glazed rice dumplings
• Zenzai — red-bean soup with mochi
• Tangyuan — Chinese glutinous rice balls
• Yaksik — Korean sweet rice cake