This recipe requires some advance preparation: The yogurt needs to drain for 12 hours.

　　This recipe can be prepared in 45 minutes or less but requires additional sitting time.

　　

Ingredients

Makes about 1 quart

　　two 32-ounce containers whole-milk plain yogurt

　　1 vanilla bean

　　1 teaspoon finely grated fresh lime zest

　　6 tablespoons fresh lime juice

　　1/2 cup light corn syrup

　　3/4 cup superfine granulated sugar

　　

Step 1

In a cheesecloth-lined large sieve or colander set over a bowl drain yogurt, covered and chilled, 12 hours. Discard liquid in bowl.

　　

Step 2

With a knife halve vanilla bean lengthwise and scrape out seeds. In a blender purée vanilla seeds, half of drained yogurt, and remaining ingredients. In a bowl stir together vanilla mixture and remaining yogurt.

　　

Step 3

Transfer mixture to ice-cream maker and freeze. Transfer frozen yogurt to an airtight container and put in freezer to harden. Frozen yogurt may be made 1 week ahead.