Preparation Melt butter in large pot over medium-high heat. Add onion and sauté until tender, about 5 minutes. Add flour and stir 1 minute. Add clam juice, broth, and half and half; bring soup to boil, whisking constantly. Reduce heat to medium and simmer until slightly thickened, whisking occasionally, about 5 minutes. Puree soup in batches in blender, adding 1 diced avocado, 2 tablespoons cilantro, chili, and lime juice to last batch. Return soup to pot. Add crabmeat and simmer until heated through, about 3 minutes. Season soup with salt and pepper. Ladle soup into bowls. Sprinkle with remaining diced avocado and cilantro.
Preparation Melt butter in large pot over medium-high heat. Add onion and sauté until tender, about 5 minutes. Add flour and stir 1 minute. Add clam juice, broth, and half and half; bring soup to boil, whisking constantly. Reduce heat to medium and simmer until slightly thickened, whisking occasionally, about 5 minutes. Puree soup in batches in blender, adding 1 diced avocado, 2 tablespoons cilantro, chili, and lime juice to last batch. Return soup to pot. Add crabmeat and simmer until heated through, about 3 minutes. Season soup with salt and pepper. Ladle soup into bowls. Sprinkle with remaining diced avocado and cilantro.