Sliced stewed tomatoes are tomatoes that have been peeled, sliced, and cooked in a seasoned liquid. Typically, stewed tomatoes are cooked with various herbs and spices such as onion, garlic, oregano, basil, and sometimes sugar or vinegar to enhance their flavor. The cooking process helps to soften the tomatoes and meld the flavors together, creating a rich and flavorful tomato sauce or base that can be used in a variety of dishes like soups, stews, sauces, or served as a side dish on its own.