- Mix together red onion, mayonnaise, cilantro, lime juice, cumin and lime zest in medium sized mixing bowl.
- Gently mix in crabmeat. Season salad with salt and pepper.
- Drizzle avocado halves with remaining 1 teaspoon lime juice to prevent discoloration and season with salt and pepper.
- Arrange avocado halves, cut side up, on plates. Fill tops of avocado with crab salad.
- Garnish salad with lime wedges.