Preparation time: 15 minutes
Cooking time: 0
Freezing time: 3-4 hours

1. In a food processor fitted with a metal blade, combine the peaches, lime juice and sugar. Process to a smooth puree.
2. Pour the puree into a shallow metal pan. Place the pan in the freezer and freeze until the edges are firm and the center is soft - about 2 hours.
3. In a large bowl, beat the egg white until almost stiff; set aside.
4. Return the semifrozen peach purée to the food processor and process until it becomes frothy - about 30 seconds.
5. Add the ginger and egg white to the processor and, using on-off pulses, process just long enough to blend in the white, 3-5 seconds.
6. Pour the mixture into a freezer container, cover tightly and place in the freezer until firm but not frozen solid, 1-2 hours. If it freezes solid, allow it to soften in the refrigerator before serving, about 30 minutes.