Ingredients
120g Cake flour
12g Cocoa powder (Van Houten)
25g Corn starch (or potato starch)
5g Instant coffee powder
8g hot water
75g unsalted butter (room temp)
70g Icing Sugar
One egg yolk
Convection oven: for 15 minutes at 140 degrees.
Conventional oven: for 14 minutes at 165 to 170 degrees.
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