What is the key leavening mechanism in choux pastry?

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Multiple Choice

What is the key leavening mechanism in choux pastry?

Steam drives the rise, with eggs contributing structure. Choux pastry stays dense and smooth on the stove while the starch and moisture develop, then in the hot oven the water turns to steam and expands, lifting the dough. The eggs set a sturdy protein network that traps that steam, creating the light, hollow interior that defines choux. This is why you don’t rely on chemical leaveners or yeast—those methods would alter texture and require different processes. Whipping air into the dough doesn’t produce the same stable structure needed to hold the steam for a proper puff.

Steam drives the rise, with eggs contributing structure. Choux pastry stays dense and smooth on the stove while the starch and moisture develop, then in the hot oven the water turns to steam and expands, lifting the dough. The eggs set a sturdy protein network that traps that steam, creating the light, hollow interior that defines choux. This is why you don’t rely on chemical leaveners or yeast—those methods would alter texture and require different processes. Whipping air into the dough doesn’t produce the same stable structure needed to hold the steam for a proper puff.

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