Soak gelatine in plenty of cold water. Drain the cherries on a sieve, collecting the juice. Heat the cherry juice, 2 tablespoons of sugar and cinnamon stick. Squeeze the gelatine and dissolve in the hot cherry juice.
Wash, peel and quarter the apple, remove the core and cut the apple quarters into slices. Remove the cinnamon stick from the cherry juice, add apple slices and cherries. Divide into 4 dessert bowls and chill.
In the meantime, bring the milk for the vanilla sauce to the boil, except for 2 tablespoons. Mix the remaining milk, sauce powder and remaining sugar. Add to the boiling milk and bring to the boil while stirring. Let the sauce cool down and serve with the jelly.