Cover a rectangular tray with baking paper and grease it with butter.
Put the yolks in a bowl. Add half of the sugar and mix until the sugar is dissolved and the yolks are light in color. Gradually add the vegetable oil, mixing continuously, until it is incorporated.
Add the milk, vanilla extract and salt. Add the lemon peel.
Sprinkle the sifted flour over the dough and mix until incorporated.
In a clean bowl or in the bowl of a kitchen mixer, beat the egg whites until they become foamy. Add the rest of the sugar and beat at high speed until the egg whites form soft peaks.
Incorporate a third of the beaten egg whites into the dough, then add the rest of the egg whites and mix until incorporated.
Pour the dough over the form, spreading the dough in an even layer using a large spatula.
Bake for about 10 minutes or until the top is elastic and the edges start to brown slightly.
Remove from the oven.
Carefully turn the hot cake over a towel, well sprinkled with powdered sugar.
Carefully roll the hot cake in the towel.
Let the rolled cake cool for about 1 hour