Chilled Puree of Beet and Watermelon
   Uses chicken stock with onion.
   http://search.yumyum.com/recipe.htm?ID=19693

Chilled Watermelon Soup
   Contains mango, ginger, kumquats, and peach, apricot or berry puree.
   http://www.jfolse.com/recipes/soups/fruit04.htm

Watermelon Gazpacho Soup
   Uses tomato, cucumber, and scallions.
   http://www.recipesource.com/soups/soups/watermelon-gazpacho1.html

Watermelon Soup with Ginger and Mint
   Made in a blender with white wine, sugar, ginger, and lemon juice.
   http://www.jewish-food.org/recipes/melonso2.htm