Uni is a Japanese name for sea urchin gonads, an organ which produces the animal's roe. It is the only edible part of the sea urchin, commonly consumed in various European, South American, and Asian countries. The texture of uni should be firm, creamy, and smooth, while its flavor is rich and briny.
Uni is usually found at local markets or restaurants, and it can be easily incorporated into a variety of dishes. However, it should always be consumed fresh, preferably just out of the shell. In most countries, it is eaten raw, usually with a splash of lemon juice.
In Japan, uni is mostly used as a sushi ingredient, though it is also easily incorporated into other Japanese dishes. In Italy (ricci di mare), they are mainly found in Sicily, Sardinia, and Apulia where they are consumed raw, usually with a splash of lemon juice and homemade bread, but they are also incorporated into pasta dishes.