Soak the gelatine in cold water. Wash lemon hot. Grate half the peel, squeeze the lemon. Mix yoghurt, sugar, grated lemon rind and juice.
Select the raspberries, rinse and drain. Squeeze the gelatine and dissolve carefully. Mix first with 4 tbsp. yoghurt, then with the rest of the yoghurt. Whip cream until stiff. Let vanilla sugar trickle in.
Fold under the yoghurt. Fold in half the raspberries.
1 small flat form (good 1⁄2 l content) rinse cold. Fill in cream. Cover and leave to cool for at least 4 hours.
Puree the remaining berries, except for 10 pieces, and icing sugar. Turn out the terrine and cut into slices or corners. Serve with sauce and the rest raspberries.