Biscuit is a kind of sponge cake, but a little less soft, less high, a little more elastic that it can be rolled up.
Ingredients for a baking tray 30 to 40 cm.
5 eggs at room temperature
100 g flour
25 cornstarch
125 g sugar
40 g butter
pinch of salt

Beat eggs with sugar and a pinch of salt. Heat over up to 45ºC.
Gently add the flour and mizena. Add the melted butter.
Brush with butter a baking tray 30 to 40 cm and cover it with baking paper. Pour the mixture and spread.
Bake in hot oven at 200ºC for 8 minutes.
Spill it on a damp cloth and remove the baking paper.
If the biscuit will be used to roll, roll it when is still warm so that catches the fold.