Cream the margarine and the sugar with the vanilla in a mixer at a strong speed. 

Use another bowl to beat the egg whites until they form stiff peaks. 

Beat lightly using a fork, the milk, the egg yolks, the brandy and the orange zest in a third bowl and combine the mixture with that of the margarine - sugar - vanilla, using a low setting on your mixer. 

Continue at a very low speed adding the stiff egg whites into the mixture and mix until you have a well incorporated batter. 

Using a different bowl sift the flour and add the mahlab, the baking powder and the walnuts, then add this to the mixture little by little using a spoon, continuing to beat at a very low speed. 

When the mixture is well combined, empty it into a baking tray of 26 cm or the round Tupperware cake mold. 

Bake at 180°C for 50΄-60.

Prepare the glaze, which should be very thick by adding as much lemon to the icing sugar as it takes (about 1 lemon). 

When the vasilopita has cooled, pour the glaze over it and let it drip to cover it. 

Decorate your cake using your imagination and your taste...