Let the steak come to room temperature for at least 20 minutes. In a bowl, combine all the ingredients for chipotle marinade. Taste for salt and set aside.

Preheat cast iron skillet to medium for 3-5 minutes.

Season steak with salt and pepper on both sides.

Drizzle 2 tablespoons of oil into cast iron skillet.

Sear and cook steak for 3 1/2 minutes per side or until internal temperature reads 135 degrees F. If you like your steak more done, leave on for an extra minute per side.

Transfer steak to a plate and pour chipotle sauce over the top. Tent with foil and let rest for 5 minutes. Slice against the grain. Serve with warm corn tortillas. Garnish with chopped cilantro, onion, serrano, lime and chipotle salsa.