Chilled Tomato Soup and Crabcakes

Name: Chilled Tomato Soup and Crabcakes
Ingredients: 8 vine-ripened tomatoes (about 8 ounces each for a total of 4 pounds); 3 teaspoons balsamic vinegar; 1/4 teaspoon chopped garlic; 1/4 cup olive oil; Kosher salt and freshly ground pepper; 6 ounces peekytoe crab (or other top quality crabmeat such as jumbo lump from Maryland); 2 tablespoons mayonnaise; 2 tablespoons chopped chives; 1 teaspoon freshly squeezed lemon juice; 2 tablespoons olive oil; 1/4 cup bread crumbs (may also use panko, the dry Japanese bread crumbs); 8 basil leaves, plus 4 basil tops for garnish; 1 ripe avocado