Sealing the edge of a pastry by pressing or folding the two layers together into a ridge, so the filling stays in while it bakes.
Technique at a glance
A compact visual model of the lesson. Use the full mechanism and success criteria below when you practice.
Concept
Sealing the edge of a pastry by pressing or folding the two layers together into a ridge, so the filling stays in while it bakes.
What changes
Two layers of dough fuse where they are pressed together with a little moisture between them — a brush of water or egg wash makes the surfaces tacky, and pressure thins the seam so it bakes through as one piece instead…
What good looks like
The edge is one continuous ridge; there is no line where the two layers meet.
Practice counts when you cook
Reading this brief does not change your School state. Finish a real practice dish in Cook mode and log the cook; that cook is the evidence that advances the skill.
What to focus on
Mechanism
Two layers of dough fuse where they are pressed together with a little moisture between them — a brush of water or egg wash makes the surfaces tacky, and pressure thins the seam so it bakes through as one piece instead of two layers sitting on each other. The pattern is not decoration: a rope fold, a fork press or a pinched ridge is a mechanical lock that holds even when the filling boils and pushes outward. Because it does push outward — the filling gives off steam as it heats, and steam needs somewhere to go. A sealed pasty or pie without a vent bursts at its weakest point, which is always the seam, so a crimp comes with a small cut or hole in the top. A dry, floury edge will not fuse at all; too thick a rope bakes hard and pale; a wet filling touching the seam soaks it and it opens.
Success criteria
The edge is one continuous ridge; there is no line where the two layers meet.
Lifted from the board, the sealed piece holds together with nothing shifting inside.
The crimps are even along the whole edge, the same size and spacing.
Out of the oven, the seam is golden and intact and any steam has come out of the vent, not the side.
Failure guards
The seam opened in the oven and the filling ran out along the side.
The edge was dry or floury so it never fused, or the pastry was overfilled and the filling reached the seam. Brush the edge, keep filling away from it, and press firmly.
A burst at the top or a weak spot, with filling boiling out.
No vent. Steam built up inside and found the weakest point. Cut a small slit in the top before baking.
The crimped edge is pale, hard and thick while the rest is golden.
Too much dough in the rope. A thick rope insulates itself. Trim the edge to a finger's width before crimping.