Brown Flaxseed, also known as linseed, comes from the flax plant. The seeds, which are a little larger than sesame seeds, contain omega-3 fatty acids, dietary fiber, and protein. Used since ancient times, flax is renowned for myriad health benefits. Add flaxseeds to breads, cookies, cereals, and pilafs, or grind them into flaxseed meal at home using a small electric grinder.