my favourite frosting-type icing is made by simply beating fat-free ricotta
cheese with icing sugar and then flavouring such as coffee, chocolate, lemon
essence, etc. sorry, i cant give you the exact amounts... probably around 2
tablespoons icing sugar to 2 cups ricotta... or to taste.
make sure you spread on cake when it has completely cooled. i have found
that the iced cake actually tastes better the next day, i dont know why, but
we usually eat it all by day two, so I dont know how much longer it will
last after that.