Add the butter, chopped apples and pumpkin and stir to coat everything. Turn the heat right down, cover, and leave to gently ‘sweat’ for 20 minutes
Add the stock, sage, beans and bring to the boil. All ingredients should be covered – add a little more water if necessary. Simmer on a low heat for 20 minutes or until the vegetables are tender
Leave to cool and then carefully blitz with a hand blender or food processor