Houttuynia

A plant, native to China and eastern Asia, that has heart shaped leaves which are commonly used as both a salad green and a cooked vegetable.

Grown as a leaf vegetable, particularly in Vietnam, where it is called giấp cá or diếp cá and is used as a fresh herbal garnish. The leaf has an unusual taste that is often described as fishy (earning it the nickname "fish mint"), so it is not enjoyed as universally as basil, mint, or other more commonly used herbs.