How to Make It
Put the cucumber in a blender or food processor, add the vinegar and pulse until finely chopped but not pureed. Transfer to a large bowl or pitcher. Add the onion, minced garlic, two-thirds of the tomatoes and half the yellow peppers to the blender and puree until smooth. Add this mixture to the cucumber. Finely chop the remaining tomatoes and yellow bell peppers by hand and stir them into the gazpacho. Whisk in the olive oil and jalapeños and season with salt, white pepper and hot sauce. Refrigerate the gazpacho until cold, at least 3 hours.
Preheat the broiler. Brush the bread on both sides with olive oil. Toast the bread under the broiler, turning once. Rub with the whole garlic clove and cut the toast into 1/2-inch dice. Serve the cold soup in shallow bowls, garnished with the hot croutons.