BOSTON BUN ........A VERY OLD RECIPE .

This recipe for Boston bun incorporates a 1/2 cup of mashed potato.
You need to use a potato that is suited to mashing .....
Preheat your oven to 160deg C ( F/F )
Grease a 20cm round cake pan and line the base with baking paper .
Using your electric hand mixer cream together 1/2 cup (115gm) of cold mashed potato with 1/2 cup of castor sugar ( 110gm ).......making sure the mixture is free of any lumps .
Now add 1/2 cup of milk (125ml )
1 heaped cup of self raising flour ( firmly packed cup )
1/2 cup of sultanas (100gm )
A pinch of salt .
Stir until combined .
Place the mixture in the pan and bake for 30minutes or until golden .
ICING
Place 125gm ( 1 cup ) of icing sugar in a small bowl with 15gm ( 1 dsp ) of margarine /butter , then stir through 1 tbs of warm water ( or enough ) to make a smooth paste .
Once  the bun is cooked remove to a wire rack and cover the top of the bun with a cotton tea towel
When the bun is completely cold spread the icing over the top  sprinkle with cinnamon sugar or alternatively sprinkle with desiccated coconut .