Using a paring knife, split the vanilla bean down the center and place in small saucepot with the orange and grapefruit juice. Bring to a boil, then transfer to a bowl and chill.
Combine and puree the cucumbers, garlic and almonds with the white grape juice, honey, a generous pinch of salt and about 1/2 cup cold water in a blender. Blend in the red wine vinegar and about 3 cups of the grapes. Taste for seasoning. Transfer to a large bowl and refrigerate until ice cold, about 2 hours.
Serve: Slice the remaining cup grapes in half. Stir the orange and grapefruit juice into the gazpacho. Serve gazpacho garnished with the remaining grapes and drizzled with the olive oil.
This recipe has been updated and may differ from what was originally published or broadcast.