In a large bowl place the cucumber, red peppers, tomatoes and lemon juice
. Cover with cold water, and salt the water as you would for pasta
. Let the bowl sit on the counter for 30 minutes, or overnight in the refrigerator. Discard the water, and blend the cucumbers
, peppers and tomatoes with the watermelon in a food processor. Press the mixture through a strainer
, then transfer the mixture to a blender and blend until smooth adding the vodka and then the sherry vinegar
, to taste. With the blender running add the oil in a thin thread until the mixture changes color (turning orange
.) Chill the mixture before serving.