1. Feed the sourdough starter 4 to 6 hours before baking until it doubles and is bubbly

2. In a mixing bowl combine starter, warm milk, melted butter and sugar until smooth

3. Gradually add flour and salt until a soft dough forms

4. Knead dough on a lightly floured surface or in a stand mixer for 8 to 10 minutes until elastic

5. Place dough in a greased bowl, cover and let rise 2 to 3 hours until nearly doubled

6. Divide dough into 8 pieces, roll each into a 20 inch rope and shape into pretzels

7. Bring water to a simmer, add baking soda and boil each pretzel 20 to 25 seconds per side

8. Preheat oven to 425°F and bake boiled pretzels 12 to 15 minutes until deep golden brown

9. Brush warm pretzels with melted butter and coat evenly in cinnamon sugar

10. Let pretzels cool on a wire rack for 10 minutes before serving