Finely chop your fresh basil, set aside.
Dice 1 cup tomato and 1/3 of cumbers; set aside.
Seed & finely dice jalapeño pepper. Set aside.
Puree remaining tomato and cucumber with watermelon in food processor or blender.
Blend until it is smooth.
Pour into large bowl. Stir in reserved diced tomato and cucumber, jalapeno, basil, lime juice and salt.
Mix well. 4. Cover and chill until cold, at least 3 hours or up to 24 hours.