Lamination — butter and dough
A croissant, a kouign-amann, a puff-pastry tart: every one of them is the same move, done differently. A sheet of butter, cold but workable, wrapped inside a sheet of dough, rolled out, folded, rested, rolled out, folded, rested — until the two are stacked a few hundred thin layers deep. Bake it and the butter steams, the layers pull apart, and the pastry rises into the honeycomb. No one's croissant fails because of the recipe; it fails because the butter and the dough met at different temperatures.
The physics
Lamination works by steam, not by yeast. Each butter layer is trapped between dough layers, and when the oven hits it the butter's water flashes to steam and pries the dough open. More, thinner, more even layers means more pried-open surfaces means the honeycomb. So the whole craft is about keeping the butter solid enough to hold its shape through the rolling, but soft enough to move with the dough. If the butter is too cold it cracks and rips through the dough, and the layers break. If it's too warm it melts out, soaks into the dough, and you end up with a heavy, greasy, flat pastry instead of a rise. The temperature window is narrow — a few degrees — and it's the whole game.
The three moves
1 · Butter and dough at the same temperature
Before you roll, the butter and the dough should feel alike: both pliable, both pressing to a dimple. If one is noticeably firmer than the other, rest the soft one or warm the hard one — a few minutes on the bench — until they match. This is the single most common mistake, and the one that undoes the rest. The butter on the site always wants to be handled at the edge of melting; here it must stay just below that edge.
2 · Roll, then fold — never press
Roll the butter out between two sheets of plastic until it's a square, wrap it, and refrigerate. Roll the dough into an oval, place the butter in the middle, and fold the dough over it like a letter — two thirds of each long side meeting the middle. That's one letter fold, and it triples the layer count. Rest for at least 30 minutes in the fridge, then repeat two or three times total. Each rest relaxes the gluten (so the roll stays flat instead of springing back) and lets the temperatures equalise again.
3 · Keep it cold to the oven
After the final roll, the dough should be cold enough to hold a cut edge. If it gets warm while you're cutting the shapes, the butter starts to leak in and the layers die. Chilling before the bake is what lets the butter stay in its layers until the oven's heat does the separating, instead of melting out on the sheet pan.
Failure modes
Butter breaking, ragged edges
The butter was too cold and hard against dough that was already pliable. It tore rather than stretched, and the layers ruptured. Fix the temperature gap first — bring the butter to a workable softness and re-wrap before rolling. Don't keep going through a tear; it spreads.
Flat, greasy, no rise
The butter was too soft the whole way through and melted out into the dough. You get a rich, cakelike pastry with a wet, heavy feel — the layers never had a chance to separate. The fix is temperature discipline on the next batch: firmer butter, longer rests, a colder bake start.
Springs back when rolling
The gluten is tight because there have been too few rests between folds. Give it another 20–30 minutes rest and the roll will go flat without the elastic fight.
In practice
The croissants are the page this article is written for — the move, told in full, with the letter-fold schedule. Everything else in the Baking section that is layered, flaky, or puffed is the same few moves at a different ratio: less butter and fewer folds for a shortcrust, more folds and more rest for a true puff. See also the wrappers logic and the yeast schedule that the dough itself runs on before the butter ever goes in.