Raspberries should not be washed vigorously, as their porous flesh and the hollow center will quickly absorb water, resulting in watery sauces and desserts. If using organic raspberries, you need only brush them gently to remove any debris. Use a soft brush like the ones designed for cleaning mushrooms, or a paper towel. If using regular raspberries, wash them briefly under cold running water and drain on paper towels.
Recipe courtesy of Williams-Sonoma and adapted from Williams-Sonoma Collection Series, Sauce, by Brigit L. Binns (Simon & Schuster, 2004).
Note: This dish contains uncooked egg whites. They run a risk of being infected with salmonella or other bacteria, which can lead to food poisoning. This risk is of most concern to small children, older people, pregnant women and anyone with a compromised immune system. If you have health and safety concerns, do not consume raw eggs.