明太子 (mentaiko) is a popular Japanese food made from salted and marinated cod roe. It is often seasoned with spices, including chili pepper, giving it a slightly spicy flavor. Mentaiko is commonly used as a topping for rice, pasta, or as a filling in onigiri (rice balls). This delicacy originated in Fukuoka, Japan, and has become a staple in Japanese cuisine. Mentaiko can be enjoyed in various dishes, such as mentaiko spaghetti or as a side dish. It is also available in different forms, including raw, cooked, or as a spread.