Toro, often used in sushi, refers to the fatty belly part of the bluefin tuna fish, known for its rich, buttery texture and marbled appearance. It is considered a delicacy and is divided into different grades based on the marbling of the meat, with Otoro being the most prized and fatty part. Toro is rare and expensive due to its limited availability and rich nutrient content, making it a sought-after ingredient in Japanese cuisine