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

2. 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 until incorporated between each addition. Use immediately.