1. Beat salad oil and milk until the oil and water are combined, add egg yolk, 20 grams of fine sugar, add lemon cubes and continue beating, add flour, stir evenly without particles.Divide the egg whites three times and add 60 grams of sugar.Beat until divided.Add one-third of the egg whites to the egg yolk batter and mix well, then add two-thirds of the egg whites and mix well.

2. Line a baking pan with oiled paper, pour the batter into the baking pan, and spread it with a spatula Make it flat and drop it a few times to remove the bubbles.

3.Preheat the oven to 160℃, bake on the upper and lower heat, and on the middle layer for about 30 minutes.

4. Take it out, place it upside down on the grill, then tear off the oil paper and let it warm , put a piece of clean oil paper underneath, with the original baking side facing up, and spread the chocolate sauce.

5. Place a rolling pin on one end of the oil paper, lift the rolling pin and oil paper forward with both hands Roll it up, wrap it in oil paper and set it for 10 minutes before unwrapping it.(I forgot to take this picture, so I used the top of this grape roll)

6.Let cool Cut into segments