Cold Lemon Soufflés

Instructions

1. Wrap a folded strip of heavy-duty foil around each of eight 6-ounce soufflé dishes to form a collar that extends 2 inches above the rims; secure with tape. Spray the insides of the dishes and foil with nonstick spray.
2. Sprinkle the gelatin over the water in a small bowl. Let stand until softened, about 5 minutes. Place the bowl in a larger bowl of hot water and stir until the gelatin is completely dissolved.
3. Put 1 cup of the sugar and the lemon zest in a food processor; pulse until finely ground. With an electric mixer on medium speed, beat the egg yolks, lemon-sugar mixture, lemon juice, and salt in a deep large bowl until combined. Fill a medium saucepan with about 1 1⁄2 inches of water and bring almost to a simmer over medium-low heat. Set the bowl with the egg yolk mixture over the saucepan and beat until very thick and pale or 160°F on an instant-read thermometer, about 15 minutes. Remove the bowl from the saucepan. Add the gelatin mixture and beat until the mixture comes to room temperature; set aside.
4. With clean beaters and the mixer on medium speed, beat the egg whites in a large bowl until soft peaks form. Increase the speed to medium-high. Beat in the remaining 1⁄2 cup sugar, 1 tablespoon at a time, until stiff.
5. Beat the sour cream on medium-high speed in a medium bowl until fluffy, about 3 minutes. Place the bowl containing the egg yolk mixture in a larger bowl filled with ice water and whisk just until the mixture begins to thicken. Gently fold in the sour cream, then the beaten egg whites just until no white streaks remain. Divide evenly among the soufflé dishes; smooth the tops. Refrigerate until chilled and set, at least 3 hours or up to overnight. Remove the collars and serve at once with blueberry sauce (if using). Yields 1 soufflé without blueberry sauce per serving.