½ cup flour
½ cup water
3 tablespoons unsalted butter, cubed
pinch of salt
pinch of sugar
2 eggs

Sift the flour onto a sheet of parchment paper. Place the water, butter, salt, and sugar in a saucepan. Heat until the butter and water come to a boil. Remove from the heat and add the flour all at once.

Mix well using a wooden spoon. Return to the heat and mix until a smooth ball forms and the paste leaves the sides of the pan.

Remove from the heat and place the paste in a bowl. Lightly beat the eggs in a small bowl. Using a wooden spoon or an electric mixer, add the eggs to the paste a little at a time, beating well after each addition.

The mixture is ready to use when it is smooth, thick and glossy