2 tbs pcornstarch
0.25 cuplemon juice
0.25 cuplime juice
2 egg whites
0.5 tsp finely grated lemon zest
0.5 tsp finely grated lime zest
2 cupfresh raspberries
Line the bottom of a six-inch (15 cm) springform pan with parchment paper.
In a saucepan off the heat, combine half the sugar with the cornstarch. Whisk in the eggs. Whisk in the lemon juice and lime juice. Bring the mixture to a boil, stirring constantly. Strain the curd through a fine sieve into a large bowl. Set aside.
In another bowl, beat the egg whites with an electric mixer until soft peaks form. Gradually add the remaining sugar, beating continuously, until the sugar has dissolved and the meringue forms stiff peaks.
With a spatula or a whisk, gently fold the meringue into the lemon curd. Spoon the mixture into the springform pan. Sprinkle the lemon and lime zests over the entire surface. Freeze for about six hours, or until the parfait is firm.
Run a knife under hot water and slide the blade between the pan and the parfait. Unmould the parfait and slice into six pieces. Garnish with the raspberries.