Meatball Subs

Name: Meatball Subs
Prep time: 30 min
Cook time: 55 min
Total time: 55 min
Yield: 8 portions
Ingredients: 3 oz old fashioned rolled oats; 3 oz cheddar cheese; 1 tsp salt; 1 tsp dried chili flakes; 2 oz yellow onion; 1 large egg; 4 oz water; 16 oz ground beef; 6 oz yellow onion; 4 garlic cloves; ½ tsp dried chili flakes; ½ oz olive oil; 14 oz crushed tomatoes; 3 ½ oz water; 1 ½ tsp Italian seasoning; 1 tsp salt; ¼ tsp ground black pepper; 8 bread rolls; 8 - 10 slices Swiss cheese; 1 ½ oz arugula leaves; 2 pickled gherkins