1/3 cup fresh lime juice 1/2 cup olive oil 1 clove garlic, minced 1 teaspoon salt 1/8 teaspoon ground cayenne pepper 2 (15 ounce) cans black beans, rinsed and drained 1 1/2 cups frozen corn kernels 1 avocado − peeled, pitted and diced 1 red bell pepper,...