In a small bowl, reserve
½ cup watermelon. Place
remaining watermelon,
tomatoes, shallots, oil,
vinegar and 2 tbsp of
cilantro in a food processor
or blender (you might
need to do it in 2 batches
depending on how big
your machine is). Purée
until very smooth.
With a large bowl
underneath, pour the
mixture through a mesh
strainer, using a ladle
to stir and push through
as much of the liquid as
possible. Discard the pulp
left in the strainer. Add
salt and pepper to taste.
Add 2 tbsp of cilantro
to the bowl of reserved
watermelon; mix together.
Pour soup into bowls
and garnish with the
watermelon-cilantro
mixture and a pinch of
crumbled feta and serve.