1. Marinate the Carne Asada:
– In a bowl, combine olive oil, minced garlic, lime juice, cumin, chili powder, paprika, salt, and pepper.
– Rub the mixture all over the steak and let it marinate for at least 30 minutes (or up to 2 hours for more flavor).

2. Cook the Steak:
– Heat a grill pan or skillet over medium-high heat. Cook the steak for 4-5 minutes per side, or until desired doneness is achieved.
– Let the steak rest for 5 minutes, then slice it thinly against the grain.

3. Assemble the Tostadas:
– Spread a layer of guacamole on each tostada shell.
– Top with slices of carne asada.
– Add pico de gallo or any additional toppings you like.

4. Serve:
– Garnish with fresh lime wedges and cilantro