Spirulina is one of the highest and most digestible sources of protein known. Once a staple food of the Aztecs, this dark green powder is now cultivated throughout the world. However, with a strong, grassy, sea flavor that easily overpowers other ingredients, working spirulina into your diet can be a challenge. Unless you're filling your own capsules and taking it as a supplement (or mixing it straight into a glass of water), you need ways to incorporate spirulina into everyday foods that are familiar to the palette and easy to prepare. Many people add a few teaspoons to a few tablespoons of spriulina to their smoothies and green juices, including fruit to moderate it's strong flavor.