Mexican Tostadas de Carne Asada

Ingredients

• 2 pounds flank or skirt steak
• 2 tablespoons olive oil
• 1/4 cup lime juice
• 3 cloves garlic, minced
• 1 tablespoon ground cumin
• 1 tablespoon chili powder
• 1 teaspoon salt
• 1 teaspoon freshly ground black pepper
• 8 tostada shells
• 1 cup refried beans
• 1 cup shredded lettuce
• 1 cup diced tomatoes
• 1/2 cup crumbled queso fresco
• 1/4 cup chopped fresh cilantro
• 1 avocado, sliced
• 1/2 cup Mexican crema or sour cream
• Lime wedges, for serving