Combine the tequila, lime zest, lime juice, garlic, cilantro, red pepper flakes, and olive oil in a zipper-sealable plastic bag or a mixing bowl. Add the shrimp and mix together to coat all the shrimp in the marinade. Refrigerate and marinate for 30 minutes to as long as 4 hours.
Preheat the grill until hot (when you hold your hand 1 to 2" above the grill grates, you want to pull it away after 2 or 3 seconds). Place the perforated plates in the BBQ Grill Pan. Preheat the pan for 2 to 3 minutes. Remove the shrimp from the marinade, shake well, and toss onto the pan. Grill the shrimp for 2 to 3 minutes per side seasoning with salt, or until cooked through but not overcooked. Serve with lime wedges and fresh cilantro leaves if desired.
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