Kohada nigiri is a popular sushi dish that features gizzard shad on top of a small mound of sushi rice. To make this dish, you will need fresh kohada fillets, sushi rice, vinegar, sugar, and salt. Start by preparing the sushi rice according to your preferred method. While the rice is cooking, marinate the kohada fillets in a mixture of vinegar, sugar, and salt. Once the rice is ready, shape it into small oblong mounds and place a slice of marinated kohada on top. Serve the kohada nigiri with soy sauce and wasabi for a delicious and elegant sushi experience.