For a healthy and flavorful meal, try making this beef and green pepper stir-fry with quinoa using a food processor. Thinly sliced beef is stir-fried with green peppers, onions, and a flavorful sauce, then served over cooked quinoa for a complete and nutritious dish. The food processor can be used to quickly and evenly slice the beef, chop the green peppers and onions, and even prepare the sauce. The beef is marinated in a mixture of soy sauce, garlic, and cornstarch, which helps to tenderize the meat and infuse it with flavor. The green peppers and onions add a fresh and crunchy texture to the stir-fry, while the sauce, made with a combination of soy sauce, oyster sauce, and sesame oil, adds a rich and savory flavor. Serve this delicious stir-fry over cooked quinoa for a satisfying and nutritious meal.