Prepare Choux Pastry: In a saucepan, combine 1 cup water, ½ cup unsalted butter, 1 tsp sugar, and ¼ tsp salt. Heat until butter melts and mixture comes to a boil. Stir in 1 cup all-purpose flour until the dough forms a smooth ball. Cool slightly and add 4 eggs one at a time, mixing until smooth and glossy.
Pipe the Dough: Transfer dough to a piping bag and pipe small rounds (about 1–1.5 inches) onto a parchment-lined baking sheet.
Sprinkle Sugar: Generously sprinkle pearl sugar over each piped round.
Bake: Bake in a preheated oven at 200°C (390°F) for 20–25 minutes until puffed and lightly golden. Do not open the oven while baking to prevent collapsing.
Cool: Remove from oven and let cool slightly before serving.