Step 1: In a large bowl or stand mixer, combine 1.5 cups warm water, 1 tablespoon sugar, and the yeast. Let sit for 5-10 minutes until foamy.
Step 2: Add the flour, salt, and 2 tablespoons of melted butter. Mix until a dough forms and pull away from the sides of the bowl.
Step 3: Knead the dough for 5 minutes until smooth. Place in an oiled bowl, cover, and let rise in a warm place for 1 hour until doubled in size.
Step 4: Preheat oven to 425°F (218°C) and line two baking sheets with parchment paper.
Step 5: Bring 10 cups of water and 2/3 cup baking soda to a rolling boil in a large pot.
Step 6: Divide dough into 8 equal pieces. Roll each into a 20-inch rope and twist into a pretzel shape.
Step 7: Carefully drop each pretzel into the boiling water for 30 seconds. Remove with a slotted spatula and place on the baking sheets.
Step 8: Bake for 12-15 minutes until dark golden brown.
Step 9: While baking, mix the remaining sugar and cinnamon in a shallow bowl.
Step 10: Brush the warm pretzels with melted butter and coat thoroughly in the cinnamon-sugar mixture.