Make sure all the ingredients, except the flour, are at room temperature.
Mix them together in a bowl, then put on the heat.
Leave it on a medium to high heat, stirring constantly until a copper cream is formed. Leave to cool.
When it is cool, add the flour and mix by hand until a soft, non-sticky dough results.
If it looks too hard, add 1-2 tablespoons of milk.
Then divide the dough into 4 equal pieces.
Roll the dough out on a sheet of baking paper sprinkled with flour.
Roll it out as thin as possible, then transfer it, along with the paper, to the back of the tray.
Bake for about 8-10 minutes, at 180° C ( 356 ℉) until the edges turn coppery.
Bake all the layers one by one. Leave them to cool on a rack and set aside the baking paper.
The layers will harden but they will soften with the cream. While waiting for the rest of the layers to bake, cover the baked ones with food-quality film so it does not dry out.