Lemongrass, one of the most common flavors in Thai and Vietnamese cooking, has many potential health benefits including lowering your cholesterol and preventing cancer. Traditional medicine from around the world has used lemongrass to treat diarrhea and relieve fevers. It's a thick, woody grass with a slightly sour lemon flavor. You can use lemongrass to brew tea or add it to curries, soups, stews and sauces.