Mix the sour cream, creme fraîche, 80 g sugar and lemon juice with a whisk. Stir in the instant gelatine. Whip the whipped cream until stiff and fold into the mixture.
Puree the raspberries with 2 tablespoons of sugar and spread on the cream. It is best to let it steep overnight.
I always take double the amount, which makes a large bowl full.