Peel and chop the apples and onions
Put the butter and oil together in a large pan, cook the onion until soft and translucent and then add the apples.
Cook for 5 minutes, add the cider, sugar and sage leaves and cook until the apples are really soft.
Either sieve the contents of the pan or use a food processor, blending until smooth.
Bottle into warm sterilised bottles. Use within 2 months or sterilise by the waterbath method to increase shelf life to one year.
Great with rich meats.