Start by combining the dry ingredients in a large bowl. Mix together the brown rice flour, arrowroot powder, psyllium husk powder, salt, and lime zest if using (optional).
Add in 3 tablespoons of melted avocado oil or coconut oil and mix it in until all of the dry ingredients are thoroughly incorporated. Now add in the warm to boiling water and stir with a spoon or spatula until it comes together into a ball of dough.
Allow the dough to sit for 15 minutes covered with a damp towel so that the psyllium husk can do its job and give structure to the tortillas. Once the 15 minutes are up, split the ball of dough in half and roll each half into a log. Cut each log into 8 equal pieces so that you end up with 16 small balls of dough.
Preheat a skillet or griddle to medium heat (around 375 degrees F). Place one of the small balls of dough onto a cutting board and roll it out with a rolling pin until it’s roughly 6-7 inches in diameter.
Place the rolled-out tortilla on the preheated skillet and cook for 1 ½ minutes or so on each side. You may need to adjust the heat based on your stovetop but try to keep it at medium heat for best results.
Once the tortillas have cooked through, transfer them to a plate and cover them with a damp towel or paper towel while you cook the remaining balls of dough. Serve warm or store in an airtight container in the fridge for up to 5 days.