How the pretzel went from soft to hard – and other little-known facts about one of the world's favorite snacks

Why are they shiny? And how did Pennsylvania become the pretzel capital of the world?

We've Been Eating Pretzels All Wrong: A History of the German Bread

The 8 Healthiest Pretzels at the Grocery Store—and 2 To Avoid

Solving the knotty question of soft-pretzel aroma

PA Food Icons: Pretzels History Of Pennsylvania Pretzels, 57% OFF

Homemade Hard Pretzel Rods Recipe

椒盐卷饼- 维基百科，自由的百科全书

18 Pretzel Facts

For A Proper Pretzel Crust, Count On Chemistry And Memories : The Salt : NPR

Original Pretzel Shells: Experience an incredible taste with Unique Snacks Original Pretzel Shells. Infused with the mouthwatering flavor and texture

Unique Snacks Original Pretzel Shells, Delicious Homestyle Baked Snack Bag, Vegan, OU Kosher, and Non-GMO Food, No Artificial Flavor, 10 Oz. Bag, Pack

Soft Pretzel Mix 50lb

Cate's Spotlight: Bristol Shop KNOT Your Average Pretzel Place