List the main steps in making choux pastry and explain why the dough must cool before adding eggs.

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This question tests understanding of the proper sequence for making choux pastry and why cooling the dough before adding eggs matters.

Choux starts with cooking flour with liquid to form a paste. This step creates a thick, cohesive dough and drives off excess moisture, which helps the dough set up so it can trap steam later for puffing. After this paste forms, you need to cool it briefly before introducing eggs. The dough should be warm, not hot, when you start adding eggs. Cooling to a safer, moderate temperature prevents the eggs from curdling or scrambling when mixed in and allows each egg to be incorporated smoothly. Adding eggs gradually, one at a time, lets the dough emulsify and thicken properly, building a glossy, pipeable dough that can hold its shape and rise when baked.

If you skip the cooling or add eggs all at once, you risk curdling the mixture, not achieving a uniform emulsion, and ending up with a dough that won’t pipe correctly or rise properly. The other options either omit this crucial cooling step, propose adding eggs at the wrong time, or skip the necessary moisture that drives the puff in the oven.