Soak gelatine in cold water. Wash, clean and chop the strawberries. Put them into a small cup, add 2 tbsp. sugar and lemon juice and puree finely. Whip cream until stiff.
Mix yoghurt and 50 g sugar. Squeeze the gelatine, dissolve warm. Stir in 2-3 tbsp yoghurt, then stir everything into the rest of the cream. Stir in the cream, except for 4 tbsp.
Divide approx. 2/3 of the yoghurt into 4 glasses (each containing approx. 200 ml). Place glasses in a cool place for about 1 hour. Mix the rest of the yoghurt and strawberry puree, except for 2 tbsp, and distribute carefully into the glasses. Pour the rest of the cream on top and decorate with strawberry puree. Chill for about 2 hours. Decorate with strawberries if desired.