toro
/ˈtɔːrəʊ/noun
mass noun
- (in Japanese cookery) tuna meat from the belly of the fish, pale pink and rich in fat and used in sushi and sashimi（日本烹饪用语）金枪鱼大脂（取自金枪鱼腹部, 肉呈淡粉色, 富含脂肪, 用来制作寿司和生鱼片）。
词源
Japanese, probably short for torori to 'melting in the mouth'.