In a large mixing bowl, combine warm water, yeast, and sugar. Let sit for 5 minutes until foamy.
Add flour and salt to the yeast mixture. Stir until a dough forms.
Knead the dough on a floured surface for about 5 minutes until smooth and elastic.
Divide the dough into 8 equal pieces. Roll each piece into a rope and shape into a pretzel.
Preheat oven to 450°F (230°C). Line a baking sheet with parchment paper.
In a large pot, bring 10 cups of water and the baking soda to a boil. Reduce heat to a simmer.
Gently lower each pretzel into the simmering water for 30 seconds. Remove with a slotted spoon and place on the prepared baking sheet.
Brush each pretzel with the beaten egg and sprinkle with coarse salt.
Bake for 12-15 minutes, or until golden brown.
Let cool slightly before serving. Enjoy!