Yellow Gazpacho with Lobster and Avocado

Name: Yellow Gazpacho with Lobster and Avocado
Ingredients: 1/2 pound watermelon cubes (2 cups); 2 large yellow tomatoes, cored and thinly sliced; 1/2 seedless cucumber, peeled and thinly sliced; 1/2 yellow bell pepper, cored and thinly sliced; 1/4 Spanish onion, thinly sliced; 1 garlic clove, smashed; 1/2 tablespoon red wine vinegar; 1/2 tablespoon Champagne or white wine vinegar; 1 tablespoon fresh lemon juice; Salt and freshly ground pepper; 1/4 cup plus 1 tablespoon extra-virgin olive oil; Two 1 1/4-pound cooked lobsters, tail and claw meat coarsely chopped (1 pound); 1 Hass avocado, thinly sliced; 1 tablespoon tarragon leaves, for garnish; 1 tablespoon mint leaves, for garnish