Home-made fruit cake, delicious, quick and easy to cook (no added sugar)

300 gm mixed dried fruit 50 gm dried cranberries 115 gm butter or margarine 250 ml boiling water 250 gm self raising flour 150 gm caster sugar or muscovado (optional) 1 tsp mixed spice 2 beaten eggs cook at 175 C. for 1 hour