Mejillones, or mussels, are a type of shellfish found in both saltwater and freshwater environments. They have a dark, elongated shell and are commonly harvested for food. Mejillones are rich in protein, vitamins, and minerals, making them a nutritious choice for many diets. These shellfish are often cooked in various ways, including steaming, boiling, or baking. Mejillones are popular in many cuisines around the world, especially in Mediterranean and Latin American dishes. They can be served alone or as part of a seafood platter, adding flavor and texture to meals.