To make these Stuffed Cabbage Rolls with Tomato Sauce gluten-free, confirm that the fire-roasted diced tomatoes, tomato sauce, red wine vinegar, spices, and seasonings are certified gluten-free or labeled free from gluten-containing additives. The cabbage, ground beef, cooked white rice, onion, eggs, parsley, olive oil, brown sugar, garlic, salt, and black pepper are naturally gluten-free, but packaged items should still be checked for cross-contact. Use clean cookware, utensils, mixing bowls, and baking dishes to prevent gluten contamination.