In the bowl of a standing mixer with the dough hook on, place the water, milk, sugar and salt, and mix a little, to then add on top the yeast and let it sit for it to rise for 10 minutes.
Add in the butter and flour and turn on the mixer to low to combine it all. Then turn the speed up and mix for about 7 minutes until you get a smooth dough.
Place the dough in a bowl with some oil on the sides, cover it up and let it rise for 1 hour.
Preheat the oven to 450°F (230°C).
Line two baking sheets with parchment paper and spread some oil on them.
Add the water and baking soda to a roasting pan or cooking pot placed on the stove to heat it to medium until it starts boiling.
To form the pretzels, cut the dough into 12 equal pieces, roll each pice into a rope and make a U shape, then roll the ends together and press them at the bottom of the U shape, as seen in the pictures below. Place the pretzels on the baking sheets.
Place each pretzels in the boiling water to cook them for 15 seconds or until they start floating. Place them on the baking sheets again.
Beat the egg and butter together and brush the mixture onto the pretzels. Then sprinkle the salt on top of each.
Bake at 450°F (230°C) for 12 to 14 minutes or until they turn golden brown.
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