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Turn these into tasty tostadas.
Garnish
Put the crabmeat in a bowl. Pick through it with your fingers to remove any cartilage. Add the oil, mayonnaise, onion, jalapeno, tomatoes, cilantro and lime zest and juice to the crabmeat.
Using a rubber spatula or spoon, gently fold (or toss) all ingredients until well-blended. Season well with salt and pepper. Top each tostada shell with a few slices of avocado, place a generous serving of the crabmeat mixture over it and garnish with a sprig of cilantro.
Serve each with a lime wedge.