What Is Zosui? Japan's Answer to Chicken Noodle Soup

Japan's version of chicken noodle soup takes about 15 minutes to make, and it starts with last night's leftover rice. That's zosui (雑炊), a traditional Japanese rice soup where pre-cooked rice is simmered gently in seasoned dashi broth, finished with silky egg ribbons, and topped with whatever you have on hand.

The name literally translates to "miscellaneous boil," though its original meaning was closer to "increased water." It was a clever technique to stretch leftover rice by adding liquid, developed long before refrigeration existed. Zosui's roots reach back to the Heian period (794–1185 AD), and historical records show it was served during imperial enthronement ceremonies.

Consumer interest in comfort food has jumped roughly 74%, and gut health interest has surged about 94% according to 2026 food trend data. Zosui checks both boxes: warm, soothing, easy to digest, and ready before you can decide what to order for takeout. A brand-new Japanese cooking enthusiast and a seasoned home chef who's been making dashi from scratch for years will both find this recipe worth keeping in rotation.

Zosui vs. Okayu vs. Ojiya: What's the Difference?

These three Japanese rice dishes get mixed up constantly, even in recipe blogs. Here's the quick breakdown:

Zosui starts with pre-cooked (leftover) rice that gets rinsed under cold water to wash away excess starch. You then simmer it in dashi broth. The result is a lighter, brothier dish where the rice grains stay relatively distinct.

Okayu begins with raw rice cooked slowly in a large volume of water until it breaks down into a thick, creamy porridge. Think of it as Japan's version of congee. It takes significantly longer to prepare.

Ojiya is the closest relative to zosui, with one key difference: the rice goes in without rinsing, so it retains its starch. The result is stickier, heartier, and more porridge-like than zosui.

The takeaway? Zosui is the fastest and easiest of the three. It's the one you make on a Tuesday night when you're tired, on a sick day when you need something gentle, or whenever you spot leftover rice in the fridge and want to turn it into something special.

The Mottainai Magic: Why Zosui Is the Ultimate Zero-Waste Meal

In Japanese culture, there's a powerful concept called Mottainai, which roughly translates to "what a waste" or "waste nothing." It's a philosophy that runs deep in Japanese home cooking, and zosui is one of its finest expressions. This dish was born from the practical need to repurpose leftover rice and stretch every grain.

That philosophy feels especially relevant when you consider that U.S. households waste approximately 26.5 million tons of food per year. Leftover-repurposing recipes aren't just smart cooking; they're a meaningful response to a real problem.

Here's where zosui gets even more brilliant: it's traditionally the "nabe night finisher." After a Japanese hot pot dinner, the broth left in the pot is rich with flavor from simmered meats, vegetables, and mushrooms. Instead of pouring that liquid gold down the drain, you add leftover rice, crack in an egg, and you've got a second meal with almost zero extra effort. It's a two-for-one dinner strategy that Japanese families have relied on for generations.

Even without nabe broth, a simple pot of dashi seasoned with soy sauce and mirin creates a beautiful base. Which brings us to what you'll need.

Ingredients You Need to Make Zosui at Home

Zosui is a pantry-friendly recipe. If you cook Japanese food with any regularity, you likely have most of these on hand already.

Core ingredients:

• 2 cups pre-cooked Japanese short-grain rice (leftover rice works perfectly)
• 3 cups dashi stock
• 1–2 tablespoons soy sauce
• 1 tablespoon mirin
• 2 eggs, lightly beaten
• 2 scallions, thinly sliced

Optional add-ins: shiitake or enoki mushrooms, shredded chicken, shrimp, tofu, spinach, nori, sesame oil

A note on dashi: if you don't have kombu and bonito flakes for homemade dashi, instant dashi packets work wonderfully. In a pinch, chicken broth or vegetable broth will also do the job. The flavor profile shifts slightly, but the dish still comes together beautifully.

Use Japanese short-grain rice specifically. Its higher starch content gives zosui the right body and texture. Long-grain or jasmine rice won't behave the same way in the broth.

Mirin adds a subtle sweetness and rounded depth to the broth. If you can't find it, mix a small amount of sake with a pinch of sugar as a substitute.

For anyone who wants to cook with authentic ingredients, we carry dashi, mirin, soy sauce, and Japanese short-grain rice here at Tomato Japanese Grocery. We ship nationwide via UPS, and if you're local to Marietta, GA, in-store pickup is always available. After more than 20 years serving this community, helping people find the right ingredients for dishes like zosui is one of our favorite things to do.

Step-by-Step: How to Make Zosui in Under 20 Minutes

Step 1: Rinse the rice. Place your leftover cooked rice in a fine-mesh strainer and rinse it under cold running water. Gently agitate the grains with your fingers until the water runs mostly clear. This step removes excess surface starch and is what gives zosui its lighter, brothier character. Skip this step and you're making ojiya instead.

Step 2: Season the broth. Pour your dashi stock into a medium pot and bring it to a gentle simmer over medium heat. Add soy sauce and mirin, tasting as you go. The broth should be savory with a hint of sweetness. You can always adjust at the end, so start conservatively.

Step 3: Add rice and extras. Add the rinsed rice to the simmering broth along with any proteins or vegetables you're using (mushrooms, chicken, shrimp, tofu). Let everything simmer together for 5 to 7 minutes. The rice will warm through and absorb some of the broth's flavor.

Step 4: The egg technique. This is the most important step. Remove the pot from direct heat, or reduce it to the lowest setting. Drizzle about half the beaten egg in a thin stream into the center of the pot. Wait 10 seconds. Then drizzle the remaining egg around the edges. Stir very gently, just once or twice. The residual heat will cook the egg into tender, silky ribbons. If you stir aggressively or add the egg to a rolling boil, you'll end up with rubbery scrambled bits instead.

Step 5: Serve. Taste the broth one more time and adjust seasoning if needed. Ladle the zosui into bowls and top with sliced scallions, a drizzle of sesame oil, or a sheet of torn nori.

No special equipment, no complicated techniques, and the whole thing is done in under 20 minutes. If you've been curious about cooking Japanese food at home but weren't sure where to start, this is an ideal first recipe.

Variations: Customize Your Zosui Bowl

Chicken zosui: Add thinly sliced poached chicken thigh to the broth along with a splash of sake. The chicken adds protein and richness, making this version especially satisfying on cold nights.

Seafood zosui: Shrimp, clams, or salmon all work beautifully here. This version is particularly good when you're using leftover nabe broth that already carries seafood flavor.

Vegetarian or vegan zosui: Build your broth with kombu-shiitake dashi, then add tofu and seasonal vegetables like spinach, daikon, or kabocha. Fully plant-based and deeply satisfying.

Mushroom zosui: A combination of shiitake, enoki, and maitake mushrooms adds layers of umami. This version also aligns nicely with the growing interest in gut-friendly, fiber-rich meals.

For a bit of regional inspiration: in Tokushima, they make soba-gome zosui using buckwheat groats instead of rice. On Hachijojima island, barley takes rice's place. These variations remind us that zosui has always been a flexible template, not a rigid recipe. Use what you have. That's the Mottainai spirit at work.

Storage, Reheating, and Meal-Prep Tips

Leftover zosui keeps well in an airtight container in the refrigerator for up to 2 days. Keep in mind that the rice will continue absorbing broth as it sits, so it will thicken over time.

To reheat without ending up with a gluey texture, add a splash of dashi or broth to the pot and warm it gently over low heat, stirring occasionally. Avoid microwaving on high, which tends to make the rice rubbery and uneven.

For meal prep, store the cooked rice and seasoned broth in separate containers and combine them fresh when you're ready to eat. This preserves the texture far better than storing the finished dish.

One honest note: zosui does not freeze well. The rice texture breaks down during freezing and thawing, so this is best enjoyed fresh or within a couple of days. Most recipes skip this detail, but we think it's worth knowing before you batch-cook a large pot.

Bring a Bowl of Zosui Into Your Kitchen This Season

Zosui is one of those rare dishes that manages to be warming, nourishing, budget-friendly, and genuinely delicious, all while taking less than 20 minutes from start to finish. It transforms leftover rice into something special, requires only pantry staples you probably already own, and delivers the kind of deep, authentic Japanese flavor that makes you slow down and savor the moment.

We'd love to see what you create. Share your zosui bowls with us and connect with the Tomato Japanese Grocery community. We're a family-owned shop that's been sharing our love of Japanese food with Marietta, GA, and beyond for over two decades, and nothing makes us happier than knowing these recipes are finding their way into your kitchens.

Make your first bowl this week, or your hundredth. Either way, zosui is a recipe worth keeping in your weekly rotation all season long.