For Meatballs: Combine eggs, milk, bread crumbs, salt and pepper; add ground beef and mix well. Form into twenty-four (24) 1 1/2 inch meatballs. (I used a melon ball scoop heaped). Brown in hot skillet. Remove meatballs from skillet.
For Sauce: Add sausage, onion, and green pepper; cook till sausage is browned. Drain off excess fat. Add water, tomato sauce, sugar, garlic salt, oregano, and parsley flakes. Return meatballs to skillet. Cover; simmer 15 minutes, stirring once or twice.
To make the sandwich: Remove top crust from rolls; hollow out, leaving a 1/4 inch wall. To serve, fill rolls with 3 meatballs each and some sauce. Top with 1 or 2 slices of cheese. Place under broiler for no more than 5 minutes – just enough time to melt the cheese.
Find it online: https://www.kitchenkreative.com/meatball-sandwich/