For a healthier twist on the classic meatball subs, try making them with turkey meatballs instead. In a Thermomix, combine ground turkey, breadcrumbs, grated zucchini, minced garlic, and a variety of herbs and spices. Shape the mixture into meatballs and cook them in a skillet until browned and cooked through. To assemble the subs, use whole wheat sub rolls, tomato sauce, and a sprinkle of Parmesan cheese. Spread some tomato sauce onto the rolls, add the turkey meatballs, and top with Parmesan cheese. Place the subs in the oven until the cheese is melted and the rolls are toasted. These turkey meatball subs are a healthier alternative that still pack a flavorful punch.