Step 1

First, prepare the marinade. In a large baking dish combine orange and lemon zest with water, pineapple juice, lemon juice, soy sauce, garlic, black pepper, and chiles.

Step 2

Now, prepare the meat. Cut off any silver skin or membrane with a sharp knife. If the thickest part is over 3/4-inch (2 cm) thick, cut the steak in half horizontally using a butterfly cutting technique.

Step 3

Transfer the meat into the marinade, making sure it is well coated. Cover with plastic wrap and marinate for 1 hour if you are using outside skirt steak, or 2 hours for inside skirt steak.

Step 4

Prepare a gas or charcoal grill, and grill the steak for 5 to 7 minutes per side, turning frequently.

Step 5

Cut the grilled steak crosswise into 1/2-inch (1.25 cm) strips. Serve hot, with warmed tortillas, grilled onions and jalapeño peppers, and condiments of your choice.