Amaranth greens, streaked through with shades of red and purple, are fresh and cheap at Asian markets right now. Like snow pea shoots, amaranth greens are one of my favorite vegetables to stir-fry: Slightly astringent when raw, the greens turn soft and mellow as they cook down. Though younger amaranth greens can be eaten raw in salads, the mature plants that you’re likely to find in Chinese and other ethnic markets need to be cooked—in stir-fries, soups, simmered dishes, and so forth.