This frozen treat features the sweet-tart flavor of a Key lime pie--but with a fraction of the calories. It's festive scooped into hollowed-out lime or lemon halves; freeze until ready to serve.

Makes 8 servings, 1/2 cup each

ACTIVE TIME: 10 minutes

TOTAL TIME: 4 hours (including chilling and freezing times)

EASE OF PREPARATION: Easy

1 cup sugar
2 teaspoons freshly grated lime zest
1/3 cup bottled Key-lime juice or fresh lime juice
2 1/2 cups boiling water
1 cup nonfat or low-fat plain yogurt

1. Combine sugar, lime zest and lime juice in a heatproof bowl. Add boiling water and stir until the sugar has dissolved. Cover and refrigerate until chilled, about 1 hour or overnight.
2. Add yogurt to the lime mixture and whisk until smooth. Pour into an ice cream maker and freeze according to manufacturer's directions. (Alternatively, freeze mixture in a shallow metal pan until solid, about 6 hours. Break into chunks and process in a food processor until smooth.)
3. Serve immediately or transfer to a storage container and let harden in the freezer for 1 to 1 1/2 hours. Serve in chilled dishes.

NUTRITION INFORMATION: Per serving: 117 calories; 0 g fat (0 g sat, 0 g mono); 1 mg cholesterol; 28 g carbohydrate; 2 g protein; 0 g fiber; 26 mg sodium.

Exchanges: 2 other carbohydrate

2 Carbohydrate Servings

MAKE AHEAD TIP: Cover and freeze for up to 2 days. Let soften in the refrigerator for 1/2 hour before serving.