The Japanese puffer fish is famous among gourmets the world over. Wrongly prepared, this succulent fish is toxic due to a build-up of poison in its ovaries and liver. Chefs have to receive a special license to prepare it (only 30% pass the rigid government exam), and even so an estimated 300 people per year die from eating fugu. The most coveted aphrodisiac preparation of fugu is made by mixing a teaspoonful of its testes with hot sake.