Watermelon Gazpacho

Name: Watermelon Gazpacho
Ingredients: 8 c. coarsely-diced watermelon, plus 1 c. finely-diced watermelon; 1 cucumber, seeded: 1/3 c. finely diced, the rest coarsely chopped; 1 small yellow bell pepper, seeded: 1/3 c. finely diced, the rest coarsely chopped; 3 scallions (white and green parts), thinly sliced; 18 basil leaves; 1/4 c. olive oil; 2 T. balsamic vinegar, or to taste; 1 t. salt, or to taste; freshly ground black pepper, to taste; juice of 1/2 a lime, or to taste; 2 c. fine sourdough bread crumbs