Prepare the cucumber
Finely chop ¼ of the cucumber and set it aside for garnish.
Peel the remaining cucumber and cut it into chunks, then transfer these to a blender.
Blend the base
In the blender, combine the cucumber chunks with the chopped tomatoes, Fresno chiles (or red bell pepper), rinsed red onion, garlic cloves, chopped cilantro, vinegar, olive oil, sea salt, and black pepper. Blend until smooth.
Season and chill
Taste the gazpacho and adjust seasoning if needed. Chill the soup in the refrigerator for at least 2 hours.
Serve
Serve cold, garnished with the reserved diced cucumber, cherry tomatoes, fresh herbs, a drizzle of olive oil, and freshly ground black pepper.