In a saucepan, whisk together egg yolks, sugar, cornstarch, and vanilla sugar. Gradually add milk while whisking. Simmer over medium heat until thickened.
Remove from heat and stir in white chocolate until melted. Allow the mixture to cool in a cool place.
In a separate bowl, beat eggs, sugar, and salt for 10 minutes until fluffy.
Fold in milk, flour, and baking powder. Spread the batter on a baking tray measuring 30 x 40 cm.
Bake at 356F (180C) for 12 minutes. Roll the slightly cooled biscuit into a roll.
Whip the cream and fold in coconut flakes. Set aside some cream to cover the roll and decorate.
Spread the remaining cream over the rolled biscuit. Decorate with coconut flakes.
Refrigerate the roll overnight before serving.
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