In a large bowl, whisk together the orange juice, lime juice, soy sauce, olive oil, minced garlic, jalapeno (if using), chili powder, cumin, smoked paprika, dried oregano, black pepper, and salt.

Place your flank or skirt steak into a resealable bag and pour the freshly made marinade over it, ensuring the beef is fully coated. Seal the bag and refrigerate for at least 2 hours, preferably overnight.

Preheat your grill to high heat or heat a cast-iron skillet over medium-high. Remove the steak from the marinade, letting excess liquid drip off. Grill the steak for 3-5 minutes per side for medium-rare.

Once cooked, transfer the steak to a cutting board and loosely cover it with foil. Allow it to rest for about 10 minutes.

After resting, slice the steak thinly against the grain, aiming for strips that are about half an inch wide.

While the steak rests, warm your corn or flour tortillas over an open flame or in a dry skillet until they become pliable.

To assemble your Beef Carne Asada Tacos, place a few slices of the grilled steak onto each warm tortilla. Top with finely chopped onions, fresh cilantro, and slices of avocado. Add your favorite salsa for a burst of flavor.

Serve your delicious Beef Carne Asada Tacos immediately with lime wedges on the side.