1. In a small pan add the water, butter, salt, and vinegar and bring to a boil.
  2. Remove the pan from the heat.
  3. Add in the tapioca flour and stir for 2 minutes until you get a wet paste.
  4. Add in the baking soda and powder and stir while the mixture foams – roughly 3 seconds.
  5. Next add in the coconut flour and egg and mix well until you get a dough.
  6. Place the dough on a piece of parchment paper and knead for 30 seconds to 1 minute.
  7. Pinch off a 1″ – 2″ piece of dough and roll into a 1/2″ round by 6″ – 7″ log.
  8. Twist into a pretzel shape and place on a piece of parchment on a baking sheet and brush with butter.
  9. Sprinkle coarse salt on the surface and bake at 350 degrees for 25 – 30 minutes.