Choose your method
- Making mochi (pounding)? → steaming method below — steamed rice is drier and produces chewier, more elastic mochi
- Sekihan (red bean rice)? → sekihan recipe section — the adzuki bean cooking liquid is the key
- Everyday sticky rice side? → rice cooker method with 1:0.8 water ratio
- What is mochi rice? → What Is Mochi Rice — starch science and varieties
- Making mochi cakes or desserts? → What Is Mochi — the finished product and its forms
Why steaming is mandatory for mochi-making (and recommended for everything else)
When regular rice is boiled, water enters the grain gradually and the moderate amylose content provides structural integrity that keeps grains separate. Mochigome has no amylose. In boiling water, the amylopectin absorbs moisture so aggressively that the exterior gelatinizes into a gummy seal before the interior is fully hydrated. The result is a mass that is sticky-wet on the outside and hard-chalky in the center.
Steaming solves this by delivering heat through vapor, not immersion. The rice is not sitting in water — it is suspended above it, receiving gentle, even heat from all directions. Combined with the long soak (which pre-hydrates the grain core), steaming produces mochigome that is translucent throughout, evenly tender, and dry enough on the surface to be workable for mochi pounding, sekihan assembly, or any other application.
A rice cooker with a dedicated mochi/sweet rice setting approximates steaming with modified timing and reduced water. It is the convenient alternative for everyday use. But for mochi-making specifically, where the drier texture of steamed rice produces a chewier, more elastic final product, traditional steaming remains the better method.
Water and timing comparison by method
| Method | Rice:Water | Soak time | Cook time |
|---|---|---|---|
| Steamer (traditional) | No water — steam only | 4–8 hours | 25–30 min |
| Rice cooker (mochi setting) | 1:0.8 | 1–4 hours | Per machine cycle |
| Instant Pot | 1:0.75 | 1–4 hours | 10 min HP + 15 min NR |
| Standard pot (not recommended) | 1:1.2 | 8 hours | 20 min on very low heat |
Method 1: Steam (traditional, best for mochi pounding)
This is the correct method when the mochigome will be pounded into mochi. The drier finish from steaming (compared to boiling) produces a chewier, more elastic mochi with better stretch.
- Rinse the mochigome 3–4 times in cold water until the water runs mostly clear.
- Soak in cold water for 4–8 hours (overnight is ideal). The grain must be fully hydrated before any heat is applied — this is not optional. Drain thoroughly before cooking.
- Line a steamer basket (bamboo or metal) with cheesecloth or a clean cotton cloth. Spread the drained mochigome in an even layer no more than 5cm deep.
- Steam over high heat for 25–30 minutes. Ensure the water in the base pot is at a rolling boil before placing the steamer on top — the rice needs continuous, vigorous steam from the start.
- Check at 15 minutes: if the center of the rice layer looks opaque or chalky while the edges are translucent, stir gently to redistribute. The outer ring cooks faster than the center.
- Done when: all grains are translucent throughout, cohesive, and no longer chalky in the center when you bite one. The texture should be tender-sticky, not hard or dry.
Critical detail: check the water level in the base pot halfway through. If the pot boils dry, the steam stops and the rice stalls mid-cook — the texture will be uneven and the center may remain hard. Keep a kettle of boiling water nearby to top up if needed.
Method 2: Rice cooker (mochi / sweet rice setting)
Most Japanese rice cookers (Zojirushi, Tiger, Panasonic) include a mochi or sweet rice (もち/おこわ) setting. This setting uses a lower water ratio and adjusted heat curve compared to the standard white rice program.
- Water ratio: 1 cup mochigome to 0.8 cups water (80ml per 100g rice) — significantly less water than regular rice
- Soak: 1–4 hours before cooking (even with the machine's built-in soak, a manual pre-soak improves texture for mochigome)
- Setting: select mochi/sweet rice/okowa — do not use the standard white rice setting
The rice cooker method produces slightly softer, moister mochigome than steaming. This is fine for sekihan, okowa, and eating as a sticky rice side dish. For mochi pounding, the steaming method is preferred because the drier texture translates to better chew in the finished mochi.
Shop Rice Cookers with Mochi Setting on Amazon →
Method 3: Instant Pot
The Instant Pot handles mochigome acceptably if you respect two non-negotiable rules: pre-soak (minimum 1 hour, ideally 4) and reduced water (1:0.75 ratio — 75ml water per 100g rice).
- Rinse and soak the mochigome for 1–4 hours. Drain.
- Add soaked, drained rice to the Instant Pot with the 1:0.75 water ratio.
- Manual / Pressure Cook on High for 10 minutes.
- Natural release for 15 minutes, then quick release any remaining pressure.
The result is comparable to the rice cooker method — slightly moister than steaming, suitable for sekihan and sticky rice dishes but not ideal for mochi pounding.
Mochi rice in practice: three recipes
Basic steamed mochi rice for pounding
Follow the steaming method above with 500g (approximately 3 cups) of mochigome. After steaming, transfer immediately to a large mortar (usu) or a stand mixer fitted with a dough hook. If using a mortar and mallet (kine), one person pounds while another folds and turns the rice between strikes — the rhythm is critical and the process takes 10–15 minutes. If using a stand mixer, knead on low speed for 5–8 minutes, increasing to medium as the mass becomes smoother.
The mochi is done when no individual grain structure remains and the mass is smooth, homogeneous, and stretches without breaking — pulling a piece should yield a clean, elastic stretch of 15–20cm before thinning. Dust your work surface and hands with potato starch or cornstarch (not flour — flour sticks and discolors). Portion into pieces while still warm — cooled mochi becomes firm and difficult to shape.
Sekihan (red bean rice)
Sekihan is festive red rice where the color comes entirely from adzuki bean cooking liquid. The mochigome itself is white — the red pigment transfers during cooking.
- Ratio: 300g mochigome + 50g dried adzuki beans
- Step 1 — Cook the beans: Rinse 50g adzuki beans. Cover with 600ml water and bring to a boil. Discard this first water (it removes bitterness). Add 600ml fresh water, bring to a boil again, then simmer 20–25 minutes until the beans are just tender but not splitting. Strain and reserve the red cooking liquid — this is the coloring agent. Spread the beans on a plate to cool.
- Step 2 — Soak the rice in the bean liquid: Place 300g rinsed mochigome in a bowl. Pour the reserved red adzuki cooking liquid over the rice, adding water if needed to just cover. Soak 4–8 hours. The rice absorbs the red pigment during soaking, turning pink.
- Step 3 — Steam or rice-cooker cook: Drain the rice (reserve any remaining red liquid). Mix the cooked beans into the rice gently. Steam for 25–30 minutes, or cook in a rice cooker on the mochi/okowa setting with 0.8 cups liquid per cup of rice (use the reserved red liquid as your cooking water).
The finished sekihan should be uniformly pink-red with whole adzuki beans distributed throughout. Season with a pinch of salt and black sesame seeds (gomashio) before serving. Sekihan is served at room temperature — the stickiness of mochigome means it holds its texture well without reheating.
Okowa (steamed sticky rice with vegetables)
Okowa is savory steamed mochigome with mixed vegetables and seasonings — essentially a sticky rice pilaf. It is a practical everyday use for mochigome that does not require pounding.
- Base: 300g mochigome, soaked 4–8 hours and drained
- Vegetables: 1 carrot (diced small), 4–5 shiitake mushrooms (sliced thin), 1 piece aburaage (fried tofu skin, sliced into strips)
- Seasoning: 2 tbsp soy sauce + 1 tbsp sake + 1 tbsp mirin, mixed together
Toss the drained mochigome with the seasoning mixture. Fold in the vegetables. Steam for 25–30 minutes using the standard steaming method, or cook in a rice cooker on the okowa setting with 0.8 cups water per cup of rice. The soy sauce adds color and umami, the vegetables provide texture contrast, and the mochigome's stickiness binds everything into a cohesive, satisfying dish. Serve in rice bowls or form into onigiri — mochigome's cohesion makes it an excellent rice ball grain.
Storage and reheating
Cooked mochigome retrogrades (hardens) faster than regular rice when refrigerated. Freezing is the better preservation method: wrap individual portions tightly in plastic wrap while still warm, then freeze. The rapid temperature drop locks in moisture before the starch has time to recrystallize.
To reheat from frozen: microwave for 2–3 minutes with a few drops of water sprinkled on top. The texture will be close to freshly steamed. Refrigerated mochigome becomes hard and dry within 12–24 hours, and reheating does not fully restore the original softness.
Finished mochi (pounded) follows different rules — see What Is Mochi for storage of the pounded product.
Frequently asked questions
What happens if I don't soak mochi rice?
The grain interior stays hard while the exterior overcooks into a gummy shell. Mochi rice (mochigome) is nearly 100% amylopectin, which absorbs water very differently from regular rice starch. Without soaking, the water cannot penetrate to the core before heat gelatinizes the outer layer, creating a seal. The result is grains that are mushy on the outside and chalky in the center — an irreversible texture failure. Minimum soak is 4 hours; overnight (8 hours) is ideal. This is not optional the way soaking regular rice is optional.
Can I use regular jasmine rice instead of mochi rice?
No. Jasmine rice is a long-grain variety with approximately 20% amylose — it cooks into separate, fluffy grains. Mochi rice (mochigome) has virtually 0% amylose and is 99% amylopectin — it cooks into a dense, sticky, gelatinous mass. These are fundamentally different starch profiles, and no technique can make jasmine rice behave like mochigome. Thai sticky rice (khao niao) is the closest non-Japanese substitute — it is also a glutinous rice variety with similar starch composition, though the grain shape and flavor differ slightly.
Why is my mochi rice hard in the center?
Two causes: insufficient soaking (minimum 4 hours, ideally 8) or insufficient cooking time. If steaming, the rice needs 25–30 minutes of continuous high-heat steam. Check that the water in the steamer base has not boiled dry — loss of steam mid-cooking leaves the center under-hydrated. If using a rice cooker, ensure you selected the mochi/sweet rice setting and not the standard white rice program. The standard program uses different timing and heat curves that do not fully cook mochigome's dense, amylopectin-heavy starch.
What is the difference between mochi rice and regular rice?
The difference is starch composition. Regular Japanese short-grain rice contains 16–20% amylose and 80–84% amylopectin. Mochi rice contains virtually 0% amylose and 99–100% amylopectin. Amylose provides structural firmness and keeps grains separate; without it, mochigome grains merge into a cohesive, gelatinous, opaque mass when cooked. This makes mochigome unsuitable for everyday rice bowls but essential for mochi, sekihan, and other preparations that require extreme stickiness. The two grains look similar raw but behave completely differently under heat.
Can I freeze cooked mochi rice?
Yes — and freezing is actually better than refrigerating for mochigome. Wrap individual portions tightly in plastic wrap while still warm, then freeze immediately. The rapid freezing locks in moisture before the amylopectin has time to retrograde (recrystallize). To reheat, microwave from frozen for 2–3 minutes with a few drops of water sprinkled on top. The texture will be close to freshly steamed. By contrast, refrigerating cooked mochigome causes slow retrogradation that makes the rice hard and dry, and reheating does not fully reverse the damage.
How do I make mochi from cooked mochi rice?
Steam the soaked mochigome for 25–30 minutes until fully translucent and tender. Transfer immediately to a large mortar (usu) or a stand mixer with a dough hook. Pound or knead vigorously until all individual grain structure disappears and the mass becomes smooth, homogeneous, and elastic — this takes 10–15 minutes by hand or 5–8 minutes in a machine. The mochi should stretch without breaking. Dust with potato starch or cornstarch to prevent sticking, then portion into pieces. Steaming (not boiling or rice-cooker cooking) is essential for mochi-making because steamed rice is drier and produces a chewier, more elastic mochi.
What is sekihan?
Sekihan (赤飯) is a festive Japanese dish of mochigome cooked with adzuki beans, where the red pigment from the beans dyes the rice pink-red. It is served at celebrations, birthdays, weddings, and auspicious occasions. The standard ratio is 300g mochigome to 50g dried adzuki beans. The beans are simmered first to release their red cooking liquid, which is then used to cook the rice — the color comes from the liquid, not from the beans themselves mixing with the grains. The mochigome's sticky texture makes sekihan distinctly cohesive compared to regular rice dishes.
Where to go next
- What Is Mochi Rice? — starch science, varieties, and why mochigome exists as a distinct grain
- What Is Sticky Rice? — Thai khao niao vs Japanese mochigome — same 0–2% amylose, different cultivars and uses
- What Is Mochi? — the finished pounded product and its many forms
- How to Use Mochi — cooking kiri mochi, daifuku, and ozoni soup with exact methods
- Sekihan — festive red rice made with mochigome and adzuki beans
- How to Cook Japanese Rice — the standard method for regular short-grain japonica
- Rice Hub — full cluster map and all rice pages