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1.
Put the egg yolk protein into two containers respectively.
2.
Make egg yolk paste: Add 25 grams of sugar to the egg yolk and beat it evenly with a whisk, then add oil, 50ml of water, and vanilla extract in sequence to continue beating evenly. Finally, sift in low powder and mix well with a spatula.
3.
Using a whisk, add 30 grams of fine sugar in three times to beat the egg whites until hard foaming.
4.
First add 1/3 of the egg whites to the egg yolk paste, stir evenly, then pour the egg yolk paste into the egg whites and stir evenly.
5.
Prepare two small bowls, put 2 scoops of mixed cake batter into the bowls, and then add 1 teaspoon of cocoa powder and corn starch, and mix well. Put them into piping bags respectively.
6.
Put a piano keyboard map in a 25*30cm baking pan, and then cover it with a layer of oil paper.
7.
First squeeze the cocoa paste into the black key, bake it in the oven at 160 degrees for one minute, then squeeze the white cake batter to make the white key, bake for 1.5 minutes and take it out.
8.
Dissolve 1 teaspoon of cocoa powder with 10ml of hot water and stir it into the cake batter to make it a lighter-colored cocoa cake batter.
9.
Pour the cake batter into a baking tray, smooth it out, knock out bubbles, put it in a preheated oven at 160 degrees and bake for 14 minutes.
10.
Put the baked cake upside down on the baking net and let it cool naturally.
11.
Whip the whipped cream until hard and the banana is ready.
12.
Dissolve 5 grams of sugar with 10ml of water, add a little rum, and brush it evenly on the cake slices.
13.
Spread the cream evenly, and arrange the banana segments.
14.
Roll up the cake slices from bottom to top, wrap both ends in oil paper and put in the refrigerator for half an hour.
15.
Take out the refrigerated cake roll and cut both ends to decorate.
16.
Put it into the plate with the music score 🎼, and put the real music score next to it.
17.
Look, there are new decorations! Did you find it?
18.
Come and see it clearly!
19.
Squeeze a line of cream frosting on the cake roll, and put the treble clef and musical notes made of chocolate on the cream frosting, which is more complete!
20.
Let’s eat!
Tips:
Different ovens have different tempers, which can be determined according to their own situation. When I was making the keyboard, the temperature was too high (the recipe says it’s 170 degrees I used at the time), so it was a bit dry and the cake cracked a bit when rolled up. So friends pay attention to control the temperature and time.
