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["Warm the butter to room temperature, cover with plastic wrap, and microwave at 600 W for 30-40 seconds to soften (adjust to your microwave strength to make sure not to let it melt too much).", "Whip into a cream.", "Add the light brown sugar in 2-3 batches, blending it into the butter with each addition.", "Stir in the light brown sugar, add the egg yolk, then evenly combine.", "Mix well.", "Sift in the cake flour.", "Switch to a rubber spatula and mix with a cutting motion.", "Continue until the dough becomes crumbly and smooth, as shown.", "Divide the dough into 4 portions.", "You should have close to 548 g, so each portion should be about 138 g. The weight may vary slightly depending on the amount of sugar and the size of the egg.", "Color one portion with food coloring.", "As shown, I added the amount that clung to a toothpick 5 times.", "Color the other portion with cocoa powder.", "Mix the colored dough separately with a rubber spatula with a cutting motion, and it should slowly come together into a ball.", "There should now be red, brown, white ""A"
