In a large bowl, combine warm water, yeast, and sugar. Let sit for 5 minutes until frothy.
Add flour and salt to the yeast mixture. Mix until a dough forms.
Knead the dough on a floured surface for about 5 minutes until smooth and elastic.
Place the dough in a greased bowl, cover, and let rise for 1 hour.
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.
Divide the dough into 8 pieces. Roll each piece into a rope and shape into pretzels.
Boil each pretzel in the baking soda 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.