A sourdough pretzel is a type of pretzel made using sourdough starter, which gives it a unique tangy flavor. The dough is typically shaped into a twisted knot and then boiled in a baking soda solution before baking. This process creates a chewy texture and a shiny, dark brown crust. Sourdough pretzels can be enjoyed plain or topped with coarse salt, and they are often served with mustard or cheese dips. They are a popular snack at fairs and festivals, and their distinct taste sets them apart from traditional pretzels made with commercial yeast.