Amaranth is a gluten free staple food and it is a powerhouse of nutrition. It contains all amino acids, including lysine, which is lacking in most grains. It’s also an excellent source of dietary fiber and iron. On how to cook amaranth, you should know that it makes for a delicious hot cereal or polenta. You can also use it to add a lovely texture to baked goods or homemade granola. With an earthy, nutty flavor, amaranth is perfect for breakfast, lunch, dinner and every snack in between.