Step 1

Preheat the oven to 375 degrees F (190 degrees C). Grease a 9-inch springform pan.

Step 2

Mix 1 teaspoon egg yolk and water in a small bowl. Set aside for glazing the cake.

Step 3

Combine remaining egg yolks, flour, butter, sugar, and cornstarch in a large bowl. Mix with an electric mixer until dough is stiff and sticky, similar to cookie dough. Knead dough a little bit to bring it together.

Step 4

Press dough into the prepared pan with your hands. Brush glaze on top.

Step 5

Bake in the preheated oven for 15 minutes. Reduce temperature to 350 degrees F (175 degrees C). Continue baking until golden brown, about 25 minutes more. Cool for 10 minutes. Slice cake crosswise.