Place the springform pan rim (26 cm Ø) on a lightly oiled cake plate. Melt butter. Put the biscuits in the plastic bag and crumble them with a dough roll. Mix the crumbs with the butter. Press them into the rim to make a cake base. Chill for about 30 minutes
Soak the gelatine in cold water. Mix yoghurt, sour cream and lemon juice. Season to taste with sweetener. Squeeze the gelatine and dissolve over a mild heat. Stir in 3 tbsp. yoghurt, then stir into the rest of the yoghurt. Whip cream until stiff and fold into the cream. If necessary, season again with sweetener
Spread yoghurt cream on the biscuit base. Chill for about 30 minutes until the cream begins to gel. Cut the strawberries in half and spread on the cake. Chill the cake for at least another 4 hours
Variation for non-diabetics
Use "normal" butter cookies for the base. Mix the cream with 125 g sugar and 1 packet of vanilla sugar