Ingredients

• vegetable oil for the grill
• 1 pound sirloin steak
• 1 tablespoon garlic salt
• 1 teaspoon ground black pepper
• 1 teaspoon ground cumin
• ground cayenne pepper to taste
• 4 mexican bolillo or kaiser rolls, split
• ¼ cup mayonnaise
• ½ cup refried beans
• 1 large avocado, thinly sliced
• 1 large tomato, thinly sliced
• 2 cups shredded lettuce
• 1 ounce crumbled cotija cheese (optional)