What is mentai?

Mentai is a traditional Japanese condiment made from pollock roe or cod roe that has been salted and seasoned with chili peppers. It is often used as a topping for rice dishes, such as mentai sushi or mentai onigiri. Mentai has a salty, spicy, and slightly fishy flavor that can add a unique kick to dishes. It is also commonly used as a filling for bread or buns in Japan. Mentai can be found in many Japanese grocery stores and is a popular ingredient in Japanese cuisine.