Step 1

Season steak on both sides with salt and pepper.

Step 2

In a mixing bowl, stir together the marinade ingredients.

Step 3

Place flank steak in a bowl or large ziplock bag and pour marinade over steak.

Step 4

Seal/cover and refrigerate, allowing the steak to marinade for 2 - 5 hours. Remove steak from the refrigerator 20 minutes before grilling.

Step 5

Heat grill to high and brush the grill grates lightly with oil. Lift steak from the bag of marinade, allowing excess marinade to drip off.

Step 6

Place steak on the grill and cook for about 3-5 minutes per side, or until desired doneness (depending on whether you like yours medium rare or well done).

Step 7

Transfer steak to a cutting board, cover with aluminum foil and allow to rest 5 minutes. Cut the steak, against the grain, into very, very thin strips.

Step 8

Warm corn tortillas on a hot dry skillet. Top with steak, pico de gallo, sliced avocado and hot sauce , if desired.