Peel the cucumber, cut it into pieces and blend it in a blender (you can take some slices for garnish).Add tomatoes (without skin), bell pepper (also without skin), peeled and chopped onion, garlic, vinegar, olive oil, salt and pepper. Blend until smooth.
Season to taste and refrigerate for at least 2 hours.
Then serve the gazpacho garnished with, for example, cucumber slices, chopped fresh herbs, a drizzle of olive oil, pine nuts, chopped cherry tomatoes or croutons, and freshly ground black pepper.