"Salt is the most common seasoning for pretzels, complementing the washing soda or lye treatment that gives pretzels their traditional skin and flavor acquired through the ...
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Maillard reaction. Other seasonings are cheeses, sugar, chocolate, cinnamon, sweet glazing, seeds, and nuts. Varieties of pretzels include soft pretzels, which should be eaten shortly after preparation, and hard-baked pretzels, which have a long shelf life." - (en.wikipedia.org 01.03.2020)