Flour, cocoa powder, sugar, vanilla sugar, soda mix in a bowl.
In a separate container in the serum add vegetable oil and soy sauce, mix.
In two or three doses, pour the liquid ingredients into a dry mixture. Whisk until smooth.
In the form of cupcakes, lubricated with vegetable oil pour the dough. Remove in the oven, preheated to 180 degrees for 35-40 minutes.
Here's a cupcake turned out. Give the cake to cool completely.
For glaze mix softened butter at room temperature, half the rate of powdered sugar and lemon juice. Beat until fluffy, gradually adding powdered sugar.
Powdered sugar may need more or less.
The fully cooled cupcake to apply the icing.