In a large mixing bowl, add yeast to room temperature water and stir. Cover with a clean kitchen towel and allow it to sit for 5 minutes.

Add in flour, sugar, and salt and mix for 1-2 minutes until a dough-like mixture forms.

Remove from the bowl and add to a floured surface. Knead the dough for about 5 minutes. Then return to the bowl, cover with a kitchen towel and allow it to rest for about 30 minutes.

While the dough is resting, add baking soda to the remaining water. Microwave for about 3 minutes or until the water comes to a boil. After boiling, remove from the microwave, stir, and allow it to rest and come to room temperature.

Remove dough from bowl and knead again. Using a sharp knife, cut the dough into 6 even sections.

Roll each section into a snake. Using a sharp knife or a pair of kitchen shears, cut about 1 inch pieces from each snake.

Working in batches, dunk each dough piece into the water/baking soda bath only long enough to get wet. Remove and place on a cooling rack.

Preheat the air fryer to 400F and spray the bottom of the basket with non-stick cooking spray.

Gently brush each dough piece with melted butter and top with coarse salt.

Place the bites inside the air fryer working in batches (be sure they don’t touch) and bake for 4-5 minutes or until golden brown.

Serve with mustard.