Japanese Rice Porridge Guide: Zengayu & Nanabugayu

When you feel under the weather, have no appetite, or simply want to give your stomach a rest, Japanese rice porridge (okayu) is the ultimate comfort food. Even on the hot days of Ho Chi Minh City, a bowl of okayu goes down surprisingly light and easy.

This guide covers the differences between zengayu, nanabugayu, and gobugayu, plus basic cooking methods and topping ideas you can try in your own kitchen.

1. Types of Japanese porridge: zengayu, nanabugayu, gobugayu, sanbugayu

Japanese porridge is categorized by the ratio of rice to water. The smaller the number, the more water is used, resulting in a thinner, silkier consistency.

Type	Rice:Water ratio	Texture	Best for
Zengayu (full porridge)	1:5	Close to rice texture, grains intact	Daily meals, mild illness
Nanabugayu (70%)	1:7	Slightly soft, most popular	Colds, late-stage baby food
Gobugayu (50%)	1:10	Very soft, grains breaking down	Weak stomach
Sanbugayu (30%)	1:20	Almost liquid, like rice water	Post-illness recovery, breaking fast

For everyday cooking, zengayu and nanabugayu are the most practical and satisfying options.

2. Basic zengayu recipe: starting with half a gō of rice

Here is the simplest way to make a full-ratio Japanese rice porridge.

Ingredients (serves 1-2)

• Japanese rice: 1/2 gō (approx. 75g)
• Water: 375ml (5x the rice volume)
• Salt: a small pinch

Steps

1. Rinse the rice gently and drain
2. Add rice and water to a pot, soak for at least 30 minutes
3. Bring to a boil over high heat, then immediately reduce to low
4. Cook with lid slightly ajar for 30-40 minutes (do not stir)
5. Turn off the heat, cover fully, and rest for 5 minutes
6. Add a pinch of salt, stir gently and serve

Tip: Stirring while cooking makes the porridge overly sticky. Keep the lid slightly open to prevent boiling over while allowing a slow, even cook.

3. Nanabugayu (7-part porridge): a gentler texture

Nanabugayu is made the same way as zengayu, with just more water added.

Ingredients (serves 1-2)

• Japanese rice: 1/2 gō (approx. 75g)
• Water: 525ml (7x the rice volume)
• Salt: a small pinch

Follow the same steps as zengayu, but extend cooking time to 40-50 minutes due to the extra water. The porridge is ready when the grains are slightly broken and the consistency is lightly thick.

If your rice cooker has an okayu (porridge) mode, use it and adjust the water level based on the ratio above.

4. Topping ideas: making okayu even better

The beauty of okayu is its simplicity, which makes it a perfect canvas for a wide range of toppings.

Classic toppings

• Umeboshi (pickled plum): bright, salty-sour flavor, great when appetite is low
• Egg: swirl in a beaten egg to make tamago-gayu, adding protein
• Salmon flakes: stir in for extra umami and body
• Nori seaweed: tear and scatter on top for a fragrant finish
• Sesame seeds and sesame oil: add a nutty, toasty note

Vietnam-friendly variations

• Shredded chicken breast: boil, shred, and stir in for a hearty bowl
• Fresh coriander (rau mùi): add on top for a local touch
• Fish sauce (nước mắm): a few drops deepen the umami flavor

5. Quick okayu from leftover rice

No freshly cooked rice? Leftover rice works just as well and cooks in much less time.

Ingredients (serves 1)

• Cooked rice: 1 bowl (approx. 150g)
• Water: 300-400ml
• Salt: a small pinch

Steps

1. Add the cooked rice and water to a pot
2. Bring to a medium boil, then reduce to low heat
3. Simmer for 10-15 minutes until the desired softness, then season with salt

This method is faster than cooking from raw rice, though the texture will be slightly less grainy. Perfect for busy evenings or a late-night snack.

6. Storage and reheating tips

Because okayu has high water content, avoid leaving it at room temperature for long periods.

• Refrigerator: cool completely, store in a sealed container, consume within 1-2 days
• Freezer: portion into single servings and freeze for up to 2-3 weeks
• Reheating: on the stovetop, add a splash of water; in the microwave, cover loosely to prevent splattering

Frozen okayu reheats surprisingly well, so it is worth making a large batch and freezing portions for quick meals.

7. Summary: order Japanese rice on the Farmi app

The key to great okayu is high-quality short-grain Japanese rice. Varieties like Koshihikari and Akitakomachi deliver a uniquely creamy, sweet flavor when cooked into porridge.

If you are looking for Japanese rice in Ho Chi Minh City, the Farmi app is your go-to. Browse in Japanese, order with ease, and have it delivered to your door in as little as one hour.

FAQ

Q. What is the difference between okayu and zosui? A. Okayu is made by cooking raw rice with plain water. Zosui is made by simmering pre-cooked rice in seasoned broth, giving it a more savory, complex flavor.

Q. How do I make okayu for a baby? A. Start with a 1:10 ratio (jūbai-gayu) and strain or blend it smooth for very young infants. As the baby grows, gradually reduce the water ratio toward nanabugayu and then zengayu.

Q. Can I find Japanese rice for okayu in Ho Chi Minh City? A. Yes. The Farmi app stocks Japanese short-grain rice with delivery available across HCMC. The app interface is available in Japanese for your convenience.

Q. Is okayu good for weight management? A. Because of its high water content, okayu has fewer calories than the same weight of plain rice. A bowl of zengayu is roughly 80-100 kcal, though toppings will affect the total.