(Gluten-free, dairy-free, can be refined sugar-free and grain-free)
To make this grain-free - substitute the 4 cups of gluten-free all-purpose flour with 3 cups of almond flour, 1/2 cup coconut flour and 1/2 cup tapioca flour. Use tapioca flour for the kneading if needed.
Adapted from Brown-Eyed Baker