Skip to main content

Omusubi With Soy-Butter Mushrooms

Omusubi With SoyButter Mushrooms recipe
Photo by Emma Fishman, Food Styling by Pearl Jones, Prop Styling by Sophie Strangio

You can find a version of the adorable Japanese stuffed rice balls known as omusubi (or onigiri) at the California chain Sunny Blue. These are filled with a salty-buttery mix of chopped mushrooms, such as earthy shiitake, shimeji, and enoki. All are easy to find in Asian supermarkets, but you can also use crimini or button mushrooms with great results. Just make sure to cut the mushrooms into fairly small pieces so they can eventually fit inside the rice balls.

All products featured on Epicurious are independently selected by our editors. However, when you buy something through our retail links, we may earn an affiliate commission.

What you’ll need

Recipe information

  • Yield

    Makes 9

Ingredients

2 cups short-grain sushi rice, rinsed until water is almost clear
2 Tbsp. unsalted butter
5 oz. shimeji mushrooms, finely chopped
3½ oz. shiitake mushrooms, stems removed, caps very thinly sliced
2 oz. enoki mushrooms, trimmed, halved crosswise
Kosher salt
1 Tbsp. plus 1½ tsp. soy sauce
1 Tbsp. sake or mirin
1 tsp. toasted sesame oil
Pinch of shichimi togarashi or crushed red pepper flakes
5 toasted nori sheets, cut in half
Furikake (for serving)

Preparation

  1. Step 1

    Bring rice and 2½ cups cold water to a boil in a medium saucepan over medium-high. Reduce heat to low, cover pan, and cook until water is evaporated and rice is tender, 18–20 minutes. Remove from heat and let sit, covered, 10 minutes. Fluff rice with a rice paddle or fork, cover again, and let sit until ready to use.

    Step 2

    Melt butter in a nonstick skillet over medium heat. Add all of the mushrooms, season lightly with salt, and cook, stirring occasionally, until slightly softened, about 2 minutes. Reduce heat to medium-low. Add soy sauce, sake, and oil and simmer, tossing occasionally, until liquid is reduced to a glossy sauce that coats mushrooms, about 2 minutes. Stir in shichimi togarashi. Transfer to a small bowl and let cool.

    Step 3

    Set up a workstation with a small bowl of water, a small bowl of salt, cooked rice (it should still be warm but cool enough to handle), mushroom mixture, and nori.

    Step 4

    To make 1 omusubi, scoop ½ cup rice onto a work surface. Dip your hands in water to moisten, then rub them with a little salt. (This prevents the rice from sticking to your hands as you work and also flavors the omusubi.) Cupping rice in your nondominant hand, make a shallow well in the center of the rice mound and fill with a heaping tablespoonful of mushroom mixture. Using your hands and moistening as needed to prevent rice from sticking, gently but firmly shape rice into a ball, fully enclosing mushroom mixture. Place rice ball back on surface and flatten lightly. Using the side of a wet chef’s knife, gently push into a triangle shape. Wrap in a sheet of nori and sprinkle with furikake. Repeat with remaining rice, mushroom filling, and nori.

Read More
This classic Japanese comfort food is a combination of chicken and egg (oyako means “parent and child”) simmered in sweet-savory broth and served over rice.
The first thing you should make with sweet summer corn.
Giving mushrooms the au poivre treatment transforms the humble shrooms into a showstopping main fit for the fanciest of bistros.
Chicken pieces and meaty bits of torn mushrooms beautifully team up in this deeply savory, scallion-studded, easy-to-make stir-fry.
Scallion-infused oil, or pa gireum in Korean, is a fragrant way to upgrade a pot of rice.
Topping a classic mushroom pot pie with crunchy, scrunched-up phyllo takes the comfort food classic from good to great.
Store-bought dumplings, fresh tomatoes, butter, and soy sauce simmer away for dinner in a flash.
Baking meatballs and green beans on two sides of the same sheet pan streamlines the cooking process for this saucy, savory dinner.