Place the butter in a stainless steel saucepan and start to melt.
Add the apples, sugar and vanilla pod.
Cook out the apple to a compote, stirring from time to time for approximately 30 minutes on a moderate heat.
If the texture is too runny then leave to reduce until you have a thick texture.
Remove the vanilla pod, and reserve for use later.
Place the apple compote into a blender, blend to a fine pulp and pass through a fine sieve. Serve.