Peel and seed the watermelon, then cut into 1-inch cubes using a sharp knife and cutting board. Spread the cubes evenly on a baking sheet or in a bowl.
4 cups watermelon cubes, seedless
Place the watermelon cubes in a blender and blend until smooth, about 1-2 minutes, creating a vibrant pink purée with no visible chunks.
4 cups watermelon cubes, seedless
Finely dice the peeled cucumber and red bell pepper, then transfer to a large mixing bowl. Stir in the chopped herbs, vinegar, and season with salt to taste.
1 small cucumber, 1/2 small red bell pepper, 1/4 cup fresh herbs (basil or mint), 2 tablespoons white vinegar
Pour the watermelon purée from the blender into the mixing bowl with the chopped vegetables. Stir thoroughly to combine, ensuring the ingredients are evenly distributed.
4 cups watermelon cubes, seedless, 1 small cucumber, 1/2 small red bell pepper, 1/4 cup fresh herbs (basil or mint), 2 tablespoons white vinegar
Transfer the mixture to a container, cover, and refrigerate for at least 1 hour until thoroughly chilled and flavors meld.
Stir the chilled gazpacho once more, then ladle into bowls and garnish with additional herbs if desired before serving cold.