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. For powdered gelatin, sprinkle over 2 tbsp cold water and let 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 and cool to room temperature.
04 - Whip heavy cream with vanilla in clean bowl until medium peaks form. Refrigerate until ready to use.
05 - Whisk egg whites to soft peaks. Gradually add powdered sugar and continue whipping until stiff, glossy peaks form.
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. Optionally dust with powdered sugar or add mint leaves before serving.