Pate a Choux

In a medium saucepan over medium-high heat, combine butter, sugar, salt, and 1 cup water. Bring to a boil and immediately remove from heat. Using a wooden spoon, quickly stir in the flour until combined.

Return pan to medium-high heat and cook, stirring vigorously, until mixture pulls away from the sides and a film forms on the bottom of the pan, about 3 minutes.

Remove from heat and transfer contents to a bowl to cool slightly, about 3 minutes. Add eggs, one at a time, stirring vigorously after each addition, and waiting to add the next egg until the previous one is entirely incorporated. Use immediately.