Preheat the oven to 200C/400F. Line two large baking trays.
Whisk the dry ingredients together in a large bowl. Add the wet ingredients and whisk well to combine. Quite quickly, the dough should thicken up from quite a wet mixture.
Get your hand into the dough and squelch it through your fingers to incorporate all the flour. The dough should be soft, juicy and feel like it has a bit of elasticity to it. There should be air bubbles from the baking powder. You should be able to pick the dough up in your hand easily, but it should feel a little bit tacky.
Allow the dough to sit for a few minutes and the tackiness should resolve as the psyllium husk powder absorbs the liquid.
If your dough has dry spots or feels more crumbly than cohesive, add a bit more water. If you squish a piece of dough in your hand, it should feel like snaky dough rather than crumbly dough. If your dough is still tacky, wait another five minutes. If it is still too tacky (it shouldn’t be) you can use a bit of tapioca flour to course correct as you roll out the dough.
Use your hands to divide the dough into 10-12 balls. Sprinkle a very scant amount of tapioca flour on a clean, dry bench.
Take the first piece of dough and roll it into a smooth ball. From here, begin rolling it out evenly into a long, thin snake. The length depends on how many pretzels you are making and your pretzel preferences, but roughly 30-40cm in length and 2cm or less in width is a good place to start.
Take the length of dough and form it into a horse shoe shape. Dab a bit of water on the tops of both the ends of the dough to help them stick.
Twist the ends of the dough over each other twice, leaving a bit of length right at the end. Dab some water on the top of the horseshoe. Lift the twisted ends up and fold them back onto the top of the horsehoe, using the water to secure the pieces. See the notes for a link to a visual demonstration – it is so much easier than it sounds.