Pretzel bread soup bowls

Ingredients:
1 1/2 cups 110 degree water
1 tsp sea salt
1 TBL sugar
5 cups flour
1 pkg yeast
olive oil (for oiling the bowl)
8 cups water
1/4 cup baking soda
1 egg yolk
1 tsp water
course sea salt

Directions:
Combine sugar and warm water in the bowl of a stand mixer.  Add yeast and let sit for about 5 minutes till foamy.  Add flour and sea salt and mix on low till blended.  Turn the speed up to medium and mix 5 more minutes till the dough is smooth and pulls away from the bowl.  Dump the dough out of the bowl and oil the bowl.  Return the dough to the bowl and cover with a towel.  Put in a warm place and let dough rise till doubled, about an hour.
Preheat oven to 450.  Line a baking sheet with parchment paper.  When the dough has risen, divide into 4 or 5 equal pieces and roll into balls.  Place on baking sheet and cover with a towel to rise a little longer, about 15 minutes.  While the dough balls are rising, boil the 8 cups of water and add the baking soda.  Add one dough ball at a time to the water for 1 minute.  Place back on baking sheet and make an "X" on the top of the bread bowls.
With a fork, mix the egg yolk and water and brush egg mixture over bread bowls.  Sprinkle with coarse sea salt.
Bake at 450 for 12-14 minutes or until golden brown.  Cool on a wire rack.  Cut around the "X" and scoop out the dough to use as a soup bowl.