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Brush off excess flour from both sides of the dough triangle and keep it on the work surface.
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Make a 1 cm cut at the mid point along the base of the triangle. Roll up the base, while gently pulling at the two corners to make the base slightly wider. (The cut that was made along the middle of the base helps with this.)
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Once you have rolled up the base once, then you can roll up the croissant the rest of the way more easily. Make sure the tip of the triangle is properly centered the whole way.
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Also make sure not to roll out the croissant too tightly or too loosely.
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Place the rolled up croissant dough on the lined half sheet baking pan (6 on a tray), while making sure the tip of the croissant triangle is placed under the croissant. Gently press on the croissant to seal the tip at the bottom into the dough (take care not to squash the croissant!).
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Cover with plastic wrap, and another half sheet pan on top. Make sure there’s plenty of space within the baking pans so that proofed croissants don’t stick to the half sheet pan on top.
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Proof the croissants (somewhere that is about 25°C / 77°F) until doubled in size. The time can vary depending on the weather. I proof mine inside an oven with just the light turned on, and it still takes me between 2 – 3 hours.
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The croissants have proofed if they have doubled in size, look very pillowy, and will jiggle a little when you give the sheet pan a shake.
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Preheat the oven to 375°F /190°C, at least 30 minutes before baking the croissants.