To add quinoa means to incorporate or introduce quinoa into a recipe, dish or meal. Quinoa is a nutritious grain-like seed that originates from South America and has become increasingly popular in recent years due to its high protein content and versatility as a food ingredient. To add quinoa can refer to cooking it and using it as a substitute for rice or other starchy ingredients, or incorporating it into salads, soups, stews, and other dishes for added texture, flavor, and nutrition.