Turkey Meatball Sandwich

Name: Turkey Meatball Sandwich
Ingredients: ½ of an onion, chopped; ½ of a green bell pepper, chopped; 3-4 garlic cloves, chopped; 28-ounce (794g) can crushed tomatoes, including the juices; 2 Tbsp (5g) chopped fresh parsley; 2 tsp (8g) sugar, to taste; 2 tsp (1g) crushed oregano; 1 tsp (0,5g) basil; 1 tsp (0,5g) crushed red pepper, optional; Dash of black pepper; Dash of salt, to taste; 1 6-ounce (170g) can tomato paste; ¼ cup (10mL) water, optional, depending on the desired consistency