Place meat into non-metallic bowl

Mix lime juice, garlic, cumin, tequila, salt and oil

Pour over meat and marinade for at least 2 hours

Heat cast iron skillet to medium high

Cut onion into rings and peppers into strips

Cook steak 9 minutes per side

Remove steak, cut against the grain, return to skillet for another 1-2 minutes to finish

Remove steak and cook onions and peppers in the grease. Add oil if needed.