Creating a delicious meatball sub is a simple and enjoyable task! Here's a basic set of instructions to assemble a meatball sub:Ingredients:Cooked meatballs (homemade or store-bought)Sub or hoagie rollsMarinara sauceGrated mozzarella or provolone cheeseOptional: grated Parmesan cheese, sliced onions, bell peppers, or any desired toppingsInstructions:Prepare the Meatballs:If using frozen meatballs, follow the heating instructions on the package. If making homemade meatballs, cook them according to the recipe until fully cooked.Warm the Marinara Sauce:In a saucepan, warm the marinara sauce over medium heat until heated through. Stir occasionally to prevent sticking.Toast the Sub Rolls:Preheat the oven to 350°F (175°C).Cut the sub rolls in half lengthwise, and place them on a baking sheet.Toast the rolls in the preheated oven for about 3-5 minutes, or until they are lightly toasted.Assemble the Meatball Sub:Place the toasted sub rolls on a clean surface.Spoon a generous amount of warm marinara sauce onto the bottom half of each sub roll.Add the Meatballs:Place the cooked meatballs evenly over the marinara sauce on each sub roll.Top with Cheese:Sprinkle a generous amount of grated mozzarella or provolone cheese over the meatballs.Add Optional Toppings:If desired, add any additional toppings such as grated Parmesan cheese, sliced onions, bell peppers, or other favorite toppings.Close the Sub:Carefully place the top half of the sub roll over the meatballs and toppings to close the sandwich.Serve and Enjoy:Serve the meatball sub immediately while it's warm and gooey with melted cheese.You can serve it with a side of extra marinara sauce for dipping if you like.Now, you're ready to savor your homemade meatball sub! Enjoy your meal.