Tomato Watermelon Gazpacho

Name: Tomato-Watermelon Gazpacho
Ingredients: 12 oz watermelon (from half a small melon), diced (about 2 cups); 2 lb ripe red tomatoes (I usually use Roma), cored and diced; 2 celery stalks, roughly chopped; 1 red bell pepper, roughly chopped; 3 green onions, roughly chopped; ¼ cup pickled jalapeño slices plus 1 Tbsp. juice; ½ tsp. salt; 2 Tbsp. olive oil