- 1 teaspoon unflavored gelatin
- 2 tablespoons fresh lime juice
- 2/3 cup thawed frozen unsweetened passion fruit pulp
- 3/4 cup sugar
- 1/4 cup water
- 3 large egg whites
- 1/3 cup chilled heavy cream
- Garnish: thin strips of lime zest
- Prepare ramekins: Cut paper into 6 (13- by 2 1/2-inch) strips. Wrap a strip tightly around outside of each ramekin to form a 1-inch collar and tape overlapping ends together. Arrange ramekins on a 9-inch baking pan.
- Make souffles: Sprinkle gelatin over lime juice in a small saucepan and let soften 1 minute. Stir in passion fruit pulp and heat over moderately low heat, stirring, until gelatin is dissolved, about 3 minutes. Transfer to a metal bowl, then set bowl in a larger bowl of ice and cold water and quick-chill mixture, stirring occasionally, until it begins to thicken, about 10 minutes.
- Heat sugar and water in a 1-quart heavy saucepan over moderate heat, stirring, until sugar is dissolved, then wash down crystals from side of pan with a pastry brush dipped in cold water. Boil without stirring until syrup registers 238 degrees F on thermometer, about 5 minutes.
- While syrup is boiling, beat egg whites with a pinch of salt in mixer at medium speed until stiff peaks form. Pour syrup in a slow stream down side of mixer bowl, beating constantly at high speed, and continue beating until meringue is room temperature, 4 to 5 minutes.
- Whisk cream in a chilled bowl until soft peaks form.
- Whisk one fourth of meringue into passion fruit pulp to lighten, then fold pulp into remaining meringue along with whipped cream. Spoon into ramekins, filling them 1/3 to 1 inch above rims.
- Freeze until firm, then cover with plastic wrap and freeze at least 2 hours. Let souffles soften in refrigerator about 20 minutes before serving.