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Instructions
Combine watermelon, tomatoes, bell pepper, cucumber, shallot, lime juice, vinegar, salt, and black pepper in a high-powered blender; blend until smooth, 20 to 30 seconds. Transfer soup to a bowl; cover with plastic wrap and refrigerate to meld flavors and chill soup, at least 1 hour.
Stir gazpacho before serving; divide between four bowls. Top servings with feta cheese and cilantro.