Because the mixtures have different densities (apparently something you can do with other types of soups, too), they don't mix when you put them in the bowl.
I added a third and it works perfectly - watermelon chunks puréed with mint and squeezed lemon juice.
1 cantaloupe, ripe
2 lemons
1 honey dew melon, ripe
2 T. lime juice (or a fresh lime)
1/2 seedless watermelon, cubed
lots of mint
salt and agave to taste
Peel and cube the first melon. This is labor intensive - use a large cutting board. First cut in half, and scoop out the seeds. Cut in 1/8s and then slice each along the curve of the melon, leaving the flesh. Cube and throw in a powerful blender, like the ninja. Or, buy it cubed!
Squeeze in the juice of the lemon and a little salt. Empty into a pitcher.
Repeat with the honey dew, adding mint, lime juice, and salt. You can add a little agave if you like it sweeter.
The watermelon is less dense but will still hold its shape. Same procedure.
Chill.
To serve, use flat soup bowls. Put a scoop of honey dew to the side of the bowl. Gently pour the cantaloupe into the open space, and also the watermelon. If you're lucky, it will create a crescent shape. So pretty.
Garnish with fresh mint. Do not serve to the Rosen clan. They don't like melons!