Rice Mayonnaise Recipe: Japanese-Style Creamy Side Dish

This Japanese-style side dish transforms simple rice into a creamy, satisfying creation with minimal effort. The secret lies in the quality of mayonnaise and proper rice preparation.

I developed this recipe after discovering how Japanese home cooks elevate leftover rice. The key is using slightly warm rice to better absorb the mayonnaise, creating that signature creamy texture.

What results is a versatile dish that works as a side or light meal. The rice maintains its individual grains while being perfectly coated in rich, velvety mayonnaise.

Serve it warm or chilled, with optional additions like cucumber, ham, or nori strips. The possibilities make this a staple worth mastering.

Ingredients for Rice Mayonnaise

Transform leftover rice into a creamy Japanese-style side with these quality ingredients.

The rice is non-negotiable—Japanese short-grain (like Koshihikari) is essential for that sticky, creamy texture. Kewpie mayonnaise (found at Asian markets or Amazon) has the right tangy richness. For rice vinegar, Mizkan brand is widely available and consistent. Don’t skip the rinse step—removes excess starch for optimal grain separation.

No Kewpie? Hellmann’s or Duke’s work in a pinch, but add 1/2 tsp sugar to mimic the sweetness. Out of rice vinegar? Apple cider vinegar at half the amount. For a nutty depth, swap white sesame seeds for black. The cucumber is optional but adds freshness—English cucumbers have fewer seeds to remove.

Best served fresh but holds well for 2 days refrigerated. Store leftovers in an airtight container—press plastic wrap directly on the surface to prevent drying. Not freezer-friendly. Bring to room temperature before serving for optimal creaminess.

Step-by-Step Instructions for Japanese-Style Rice with Mayonnaise

Master the technique for this creamy dish with precise timing and proper temperature control.

Step 1: Prepare and Cook the Japanese Short-Grain Rice

Rinse the 2 cups Japanese Short-Grain Rice under cold water until the water runs clear to remove excess starch. This prevents a gummy texture in the finished dish. I use a fine-mesh strainer for this step to ensure thorough rinsing without losing any grains.

Combine the rinsed rice with the 2.5 cups Water in a medium saucepan. Bring to a boil over high heat, then immediately reduce to low heat, cover, and simmer for 15 minutes until all liquid is absorbed and the rice is tender. Remove from heat and let it sit covered for 10 minutes to steam.

Step 2: Prepare the Seasoning Mixture

While the rice cooks, whisk together the 1 tbsp Rice Vinegar, 1 tsp Granulated Sugar, 0.5 tsp Sea Salt, and 1 tbsp Soy Sauce in a small bowl. Continue stirring until the sugar and salt fully dissolve—this creates a balanced seasoning base that will distribute evenly through the dish.

This step ensures every grain of rice carries the subtle sweetness and umami depth characteristic of authentic Japanese flavors. The vinegar’s acidity also brightens the richness of the mayonnaise that follows.

Step 3: Combine Rice with Mayonnaise and Seasonings

Transfer the warm rice to a large mixing bowl and let it cool slightly for 2-3 minutes. Add the prepared seasoning mixture and the 0.5 cup Mayonnaise, then fold everything together gently using a rice paddle or silicone spatula. The rice should be evenly coated with a creamy, glossy sheen.

Be careful not to overmix, as this can break the rice grains and make the texture pasty. The mayonnaise should create a smooth, velvety consistency without being greasy. Taste and adjust seasoning if needed, though the measured amounts should provide perfect balance.

Step 4: Add Fresh Vegetables and Garnishes

Fold in the 0.5 whole Fresh Cucumber (seeded and finely diced) to add a refreshing crunch. The cucumber’s coolness contrasts beautifully with the warm, creamy rice. Distribute it evenly so every bite includes this textural element.

Thinly slice the 1 sheet Nori Seaweed Sheets into strips and the 2 whole Green Onions into thin rounds. Sprinkle these over the rice along with the 1 tsp Sesame Seeds, reserving a small amount of each for final garnish. These toppings add color, a subtle oceanic note from the nori, and a nutty aroma from the toasted sesame.

Make-Ahead Tips for Leftovers

Prep Rice Ahead

Cook the 2 cups Japanese Short-Grain Rice up to 1 day in advance and store it in the fridge. Let it come to room temperature before mixing with mayonnaise for best texture. Cold rice absorbs flavors better. 💡

Mix Components Separately

Prepare the seasoning mixture and chop all vegetables the night before. Store them in separate airtight containers in the fridge. This cuts your assembly time to just 5 minutes on serving day.

Last-Minute Assembly

Only combine the rice, mayonnaise, and seasonings right before serving. The rice grains stay intact, and the dish maintains its creamy consistency. I always do this step fresh.

Chill for Flavors

If serving cold, assemble the dish completely and refrigerate for at least 1 hour. This allows the flavors to meld beautifully. The mayonnaise will thicken slightly, creating a richer mouthfeel.

Garnish Fresh

Add the nori strips, sesame seeds, and green onions just before serving to maintain their texture and color. Toasting the sesame seeds right before garnishing enhances their aroma.

Avoid Freezing

This dish doesn’t freeze well—the mayonnaise can separate, and the rice texture suffers. Stick to making just what you’ll eat within 2 days for the best quality. ❄️

Frequently Asked Questions