Grease and line a 10x8 inch baking tray
Cream the dairy-free spread and sugar together
Mix the baking powder, polenta and ground almonds together
Beat the eggs and add to the creamed spread and sugar
Fold in dry ingredients and mix until smooth
Mix in the juice and zest
Pour into the prepared tin
Bake at gas mark 4, 180C for 40 minutes
Allow to cool completely before removing from the tin.
For the glacé icing
Sieve the icing sugar into a bowl
Add the orange juice and mix until smooth
Add a few drops of orange colour to achieve the shade you want
Adjust the quantities of liquid and sugar until you have a paste that is just thick enough to coat the back of a spoon
Spread a thin layer of shredless marmalade on top of the cooled cake.
Pour on the icing, smooth and leave to set.