Place the diced watermelon, chopped tomatoes, red bell pepper, and cucumber into the blender.
4 cups watermelon, diced, 2 medium ripe tomatoes, chopped, 1 red bell pepper, chopped, 1 cucumber, peeled and chopped
Add the olive oil, red wine vinegar, smoked paprika, and a pinch of salt to the blender.
2 tablespoons olive oil, 1 tablespoon red wine vinegar, 1 teaspoon smoked paprika, to taste salt
Puree the mixture until smooth and silky, about 30-60 seconds; check for consistency and adjust seasoning as needed.
Pour the purée through a fine mesh sieve or strainer into a mixing bowl, gently pressing to extract some of the liquid and achieve a smooth texture.
Transfer the strained soup into a covered container and refrigerate for at least 2 hours until chilled thoroughly.
Serve cold, garnished with chopped fresh basil and a drizzle of olive oil if desired.
4 cups watermelon, diced