Mentaiko mayo onigiri is a quick Japanese rice ball recipe that combines warm seasoned rice with a spicy creamy cod roe filling. The filling is usually made by mixing mentaiko or spicy pollock roe with Japanese mayonnaise, soy sauce, lemon juice, or a little sesame oil until smooth and savory. Freshly cooked short grain rice is shaped around the filling by hand or with a mold, then wrapped with nori for a crisp seaweed aroma and easy serving. The creamy mayo softens the salty heat of the mentaiko while the rice keeps each bite simple, filling, and balanced. Extra toppings like sesame seeds, green onion, furikake, shiso, or toasted nori flakes can add more texture and flavor. The final onigiri is fast, satisfying, and easy to pack for lunch, snacks, bento boxes, picnics, or a simple Japanese-style meal at home.
