Betul Tunc on Instagram: "These meatballs are a family recipe near and dear to us, make for a hearty and delicious sandwich for the cold weather! They can be extra special with homemade cheese and bread, or a quick weeknight meal if using store-bought ingredients. I hope you all are staying warm as the season changes ❤️ Meatball Sub Sandwiches Yield: 16-18 Meatballs, about 4 sandwiches Ingredients For the Meatballs: 1 1/2 lbs ground beef 1 small onion or ½ medium onion, coarsely grated and light