How to Make It
Light a grill or preheat a grill pan. In a bowl, combine the tomatoes with the onion, bell peppers, garlic, olive oil and cilantro. Season with salt and pepper.
Season the skirt steak with salt and pepper. Grill over moderately high heat for about 3 minutes per side, or until lightly charred and medium rare. Transfer the steak to a cutting board to rest for 5 minutes. Thinly slice the steak on the diagonal and pass the salsa separately.