This can be made with any fruit - red or black cherries, strawberries, loganberries, bilberries, etc., and instead of the vanilla sauce, you could serve quark. This looks pretty served in goblets.
Only wash the berries if necessary. Rinse in a sieve a few at a time, allow to drain, and dry with kitchen paper.
Remove the stalks from the berries.
To make the red berry juice, boil up the raspberries, redcurrants and water, then simmer over a gentle heat for 5 minutes. Push the berries through a sieve.