Preheat the oven to 180C/350F/gas mark 4
Use a 900g/2 lb loaf tin.
Peel, core and chop the apple. Grease the loaf tin and line with greaseproof paper. Place all the ingredients except the icing sugar in a large bowl and beat with a wooden spoon until well combined. Turn into the prepared tin and level the surface. Bake for 1 hour. Reduce the oven temperature to 170C/325F/gas mark 3 for a further 20 minutes or until well risen and firm to the touch. Turn out and cool on a wire rack. When cold, dredge with icing sugar.
