1  medium        sized watermelon
       1  cup           mascarpone cheese
       1                orange, zested and segmented, -- juices set aside
       2                lemons, zested and segmented, -- juices set aside
       1                grapefruit, zested and segmented, -- juices set=
 aside
       2  tablespoons   sugar
Cut watermelon in half lengthwise. Using a melon baller, cut into balls and
place in a shallow serving bowl.
In a blender, mix the mascarpone and the citrus fruit juices and the sugar
until smooth. If too thick, thin with a little water (it should be as thick
as yogurt). Drizzle the mascarpone over the watermelon balls and sprinkle
the fruit segments over and serve cool.