Roughly dice the watermelon and discard its skin and seeds—similarly, chop cucumber, pepper, tomato, and onion. I remove and discard the seeds/pulp of all the vegetables.
Add chopped watermelon, vegetables, herbs, salt, pepper, and garlic to the blender. DO NOT add water.
Blend them until smooth. Add extra virgin olive oil and wine vinegar, taste gazpacho if required, add more seasoning, and blend one last time for a few seconds.
At this stage, if you prefer, you can pass this cold soup through a sieve to get a smooth, light consistency or serve it as it is – thick and luscious.
Garnish watermelon gazpacho with finely chopped herbs (basil and mint), cucumber, and feta cheese.
Serve watermelon gazpacho chilled or at room temperature with a bread slice.