Directions:
In an extractor, juice the raspberries, blueberries and apple, in that order, according to the manufacturers instructions. It may be necessary to open the machine and push any remaining puree through the spout. Stir in the yogurt. Taste for sweetness, adding the sugar if needed. Stir again and serve.
Serves 1.
Adapted from Williams-Sonoma Cookware Series, Juicer Cookbook,
by Carol Gelles
(Time-Life Books, 1998).