Makes 12 servings
750 ml vodka
1 bottle fresh grapefruit juice (Simply brand works well)
1 cup simple syrup
One dozen egg whites, yolks reserved for another use
1. Add a shot of vodka (1½ ounces), 1 ounce simple syrup, 3 ounces grapefruit juice, and one egg white to a shaker or glass jar.
2. Shake - without ice - for about 30 seconds. If you use a glass jar, you'll be able to see the egg foam develop. Add ice and shake for 10 seconds more to chill. Strain over a martini glass and garnish with a brûléed grapefruit slice. (See next step.)
3. To make the garnish: Use a mandolin or very sharp knife to slice grapefruit into thin rounds. Lay out on paper towels to dry slightly. Arrange in a single layer on a cookie sheet and sprinkle one tablespoon of sugar over each slice. Place under broiler for 8-10 minutes, or use a torch to caramelize until golden.