For each serving, layer as follows: 1 crushed tostada, 1 cup loosely packed lettuce, 1/2 cup meat, 1/4 cup shredded cheese, 1/3 cup tomatoes, sprinkle of chopped green onion, 2 tablespoons olives, and 1 more lightly crushed tostada. Garnish with 1 tablespoon sour cream and 2 tablespoons salsa.