Heat grill to a medium-high heat and grill steak on both sides until seared almost to desired doneness (steak will continue to cook in the sauce).
In a large sauté pan, heat the Tantillo Extra Virgin Olive Oil and add garlic. Cook for 1 minute- until golden and add onions, cubanelle pepper, and Roma tomatoes. Stir everything together.
Cook together and lower heat to a rolling simmer. Add in basil leaves, sea salt, pepper, and steak.
Simmer together for 3 minutes, continuously scooping the sauce on top of the steak.
Serve hot with fresh mozzarella, chopped Italian parsley, and red pepper flakes.