For the panna cotta, soak the gelatine leaves in a little cold water until soft.
Place the milk, cream, vanilla pod and seeds and sugar into a pan and bring to a simmer. Remove the vanilla pod and discard.
Squeeze the water out of the gelatine leaves, then add to the pan and take off the heat. Stir until the gelatine has dissolved.
Divide the mixture among four ramekins and leave to cool. Place into the fridge for at least an hour, until set.
For the sauce, place the sugar, water and cherry liqueur into a pan and bring to the boil. Reduce the heat and simmer until the sugar has dissolved.
Take the pan off the heat and add half the raspberries. Using a hand blender, blend the sauce until smooth.
Pass the sauce through a sieve into a bowl and stir in the remaining fruit.
To serve, turn each panna cotta out onto a serving plate. Spoon over the sauce and garnish with a sprig of mint.