01 - Puree raspberries with sugar and lemon juice in blender until smooth. Strain through fine sieve to remove seeds. Set aside.
02 - Soak gelatin sheets in cold water for 5 minutes, or sprinkle powdered gelatin over 2 tbsp cold water to bloom.
03 - Gently heat 2 tbsp raspberry puree in small saucepan until warm. Squeeze water from gelatin sheets and stir into warm puree (or stir bloomed powdered gelatin until dissolved). Mix back into remaining puree. Cool to room temperature.
04 - In clean bowl, whip heavy cream with vanilla until medium peaks form. Refrigerate until ready to use.
05 - In separate bowl, whisk egg whites to soft peaks. Gradually add powdered sugar and continue whipping to stiff peaks.
06 - Gently fold raspberry puree into whipped cream until almost combined. Carefully fold in meringue until smooth and fully incorporated.
07 - Spoon or pipe mixture into serving glasses. Refrigerate for at least 2 hours until completely set.
08 - Top with fresh raspberries and optionally dust with powdered sugar or add mint leaves before serving.