This heavenly Lemon and Lime Souffle is a creamy frozen twist on a classic indulgence with refreshing citrus flavor, and it's easy but impressive.
Cut a piece of aluminum foil large enough to wrap around the outside of a 6-cup (48 fl oz/1500 ml) capacity souffle mold.
Fold the foil in half lengthwise, then wrap it around the souffle mold so that the foil extends 3 inches (7 ½ cm) above the rim of the mold, and secure it with tape. (Be patient with yourself – it can be easier said than done!) Set aside.
In a medium saucepan over medium-low heat, combine the sugar, zest, and juice and heat until simmering.
Whisk the egg yolks while adding the hot lemon-lime mixture, one ladleful at a time, until it is incorporated.
Whip the whites on medium speed for 2 minutes until foamy and thickened, then increase the speed to high and whip to stiff peaks, 3 to 4 minutes. Fold the whipped whites into the chilled curd using a thin-edged metal spoon.