Chewy, salty, golden brown pretzels with a wonderful sourdough flavor. Perfect with mustard or cheese dip.

Combine starter, warm water, brown sugar, and melted butter in a large bowl.
Add flour and salt. Mix and knead for 10 minutes until you have a smooth, slightly firm dough.
Cover and let rise at room temperature for 3-4 hours until doubled.
Preheat oven to 425°F (220°C). Line two baking sheets with parchment paper.
Divide dough into 8 equal pieces. Roll each piece into a 24-inch rope.
Form into a pretzel shape: make a U-shape, then cross the ends over each other twice and press them down onto the bottom of the U.
Bring the water and baking soda to a boil in a wide pot.
Boil each pretzel for 30 seconds, flipping once. The baking soda bath is what gives pretzels their signature dark brown color and chewy skin.
Place boiled pretzels on the prepared baking sheets. Sprinkle generously with coarse salt.
Bake for 12-15 minutes until deep mahogany brown.
Brush immediately with melted butter when they come out of the oven.