These grapes make for both an elegant winter centerpiece and a sweet treat for the holidays.
Active time: 30 min Start to finish: 2 1/2 hr
Cooks' notes:
Frosted grapes can be made 2 days ahead and kept, uncovered, in a cool dry place (do not refrigerate). The egg whites in this recipe are not cooked. Use pasteurized egg whites if there is a problem with salmonella in your area.
