perfect butter cream icing

My daughter Madisen has really got a love for baking and icing cakes so this afternoon we were

making butter cream frosting.

This is the one that stayed the most stiff and piped the best.

1 cup shortening
4 cups icing sugar
1 tsp vanilla
4 tbsp milk
1 tbsp cream of tarter

we used wilton's icing colour, It doesn't make the icing runny


i will post some pictures later tonight