1) If you would like to garnish the soup with frozen grapes, place a handful of halved grapes on a small tray or plate, cover with plastic wrap, and freeze for 30 minutes. (Don't freeze the 2 cups of grapes, though.)
2) In the bowl of a food processor or large blender, combine the cukes, the 2 cups grapes, bread, salt, kefir or laban, vinegar, and honey and blend until smooth.
3) With the processor or blender running, drizzle in the oil. It is ready to serve now, but excellent fully chilled. It will keep for 8 to 12 hours in the refrigerator, but will need to be reblended before serving.
4) When you are ready to serve, divide the reserved sliced grapes and almonds among the bowls and serve.
This recipe was loosely adapted from Bon Appetit’s White Gazpacho.