Chop the onion, put it into a saucepan and fry it very gently in the butter for 10 min. Chop the apple and cook it in the butter with the onion for a further 10 min. Stir in the curry powder and heat it for a few minutes. Add the flour and then stir in the liquid. When boiling, add all the other ingredients and simmer the sauce for at least ½ hr., or better 1½ hr.
To make the coconut