1. Preheat oven to 350°. Grate zest from 1 lime to equal 1/2 tsp. Squeeze juice from limes to equal 6 Tbsp. Gently combine zest, lime juice, crabmeat, and cilantro.
2. Bake buns at 350° for 7 minutes or until toasted.
3. Spoon crabmeat mixture into buns; sprinkle with mango and avocado. Serve immediately.