In a bowl, cover the prunes with the hot water and let soften for about 20 minutes. Reserve the soaking water and coarsely chop the prunes.
In a blender, mix the yogurt with the ice, maple syrup, vanilla and rum. Add the prunes and their soaking water and blend. Serve or pour into a thermos.
Make Ahead: The shakes can be refrigerated overnight. Shake before drinking.
Notes: One Serving: 243 calories, 2 gm total fat, 5 gm saturated fat, 54 gm carb.
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