Begin with the sauce:

In a small saucepan, heat oil over medium heat.

Add garlic and cook 1-2 minutes, until softened and fragrant.

Add tomatoes, red pepper flakes, parsley, oregano, salt, and pepper.

Bring to a boil, then reduce heat to low. Simmer, stirring frequently, until heated through.

Add the meatballs, stirring to thoroughly coat with the sauce and heat through.

To serve:

To each split sub roll, add a handful of arugula.