How pretzels are made
Soft pretzels get their dark skin from a quick dip in a lye bath just before baking.
- stations
- 7
- things upstream
- 33
- raw sources
- 12
- steps from the ground
- 9
The short version
A lean yeast dough is rolled into a long rope and twisted into the knot. The knots are dipped or sprayed with a hot alkaline solution of lye or washing soda, sprinkled with coarse salt and baked. The alkali speeds the Maillard reaction on the surface, giving the deep brown color and the pretzel flavor.
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Mix a lean dough
Flour, water, yeast and salt are mixed, with little or no sugar or fat. The dough is firm so the shape holds as the pretzel bakes.
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Rest the dough
The dough rises briefly to build flavor and make it easy to handle. Pretzels are not proofed as fully as bread.
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Extrude into ropes
Pieces of dough are rolled or extruded into ropes with tapered ends. The ropes have to be long and thin to make the traditional shape.
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Twist the knot
The ends of each rope are crossed over in a symmetrical form and pressed down onto the loop. Machines now twist pretzels at high speed, and the knot is the distinctive shape of the product.
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Dip in the alkali bath
The knots go through a warm solution of lye (sodium hydroxide). A weaker option is a baking soda solution. The alkali changes the chemistry of the dough surface so the crust browns and tastes like a pretzel. Factories handle the lye with strict safety controls.
Goes in -
Salt and slash
Coarse salt is sprinkled on top. Many soft pretzels are slashed across the thick part so the dough can open as it bakes.
Goes in -
Bake dark
A hot oven sets the shape and browns the skin through the Maillard reaction. Hard pretzels are baked again to dry them into crisp, long-keeping snacks.
Worth repeating
- Pretzels have been a bakers' emblem in southern Germany since at least the 12th century.
- The same lye dip makes other Bavarian lye pastries such as lye rolls and lye croissants.
Back to the ground
Follow every input upstream and pretzel starts as these 12 raw sources.
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Sources
Cite this page: "How pretzels are made." Assembly Line, 2026-11-03. https://assemblyline.org/make/pretzel