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