In a stand mixer bowl combine warm water yeast and butter and mix briefly
Let sit for 5 minutes
Add flour and salt and mix on low speed until combined
Increase to medium speed and knead for 4 minutes until smooth
Remove dough and shape into a ball
Place in a greased bowl and coat lightly with oil
Cover and let rise in a warm place for 1 hour until doubled
Preheat the oven to 425°F
Line two baking sheets with slipat sheets or foil, if using foil spritz with oil, set aside
Bring 10 cups water to a boil in a large pot
Slowly add baking soda to avoid overflow
Divide dough into 8 pieces
Roll each piece into a 12 inch rope
Cut each rope into 8 bite sized pieces
Roll and cut 1/2 of the pretzel dough and keep the other dough covered
Boil dough pieces in batches for about 30 seconds
Remove with a slotted spoon and place on one of the prepared baking sheets
Whisk egg and water together
Brush over the pretzel bites
Sprinkle with salt
Bake for 15 minutes turning the sheet pan as needed to brown them evenly
Repeat the rolling, cutting, boiling process for the second half of the dough, place on the second prepared sheet brushing them with the egg wash and sprinkling with kosher salt
Cool for 5 to 10 minutes before serving