Pizza Joes - I Ate The 80's

Ingredients

• 1 lb ground beef or Italian sausage (if you use sausage, omit salt and fennel)
• ¼ cup chopped onion
• 1 8 oz can pizza sauce
• 2 tbsp Parmesan cheese
• ½ tsp salt
• ¼ tsp fennel seed
• 6 hard rolls or frankfurter buns
• 6 slices mozzarella cheese