Classic Marble Cake|Apron

Ingredients are here : ^^
Classic Marble Cake|Apron

Whole egg   4 (55g+- an egg)
Sugar    115g|1/2cup
Unsalted butter   150g|2/3cup
Cake flour   150g|1cup
Baking powder   1tsp
Salt   1/4tsp
Cocoa powder   2Tbsp
Hot water   2Tbsp

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