Soak 3 leaves of gelatine in each. Mix prosecco and syrup. Wash, clean and crush 350 g berries. Squeeze 3 sheets of gelatine, dissolve. Stir in Prosecco
Line a box form (approx. 1 1/4 l capacity; approx. 21 cm long) or bowl with foil. Add 1/2 berries. Add 1/2 jelly liquid. Cool for approx. 40 minutes
Mix mascarpone, yoghurt, 50 g sugar, peel and juice. Squeeze 3 sheets of gelatine, dissolve, stir in 2 tablespoons of cream. Mix with the rest of the cream. Spread half on the jelly. Chill for about 30 minutes (do not refrigerate the rest)
Carefully spread the rest of the berries and jelly liquid over the cream. Cool for about 40 minutes. Spread the rest of the cream on the jelly. Chill for at least 4 hours or overnight.
Wash and clean 150 g berries and, except for a few, puree with 1-2 tbsp. sugar. Turn the terrine over and carefully remove the foil. Cut into slices and serve