Stir together tvp and boiling water and set aside to soak for 5 minutes. Meanwhile, mix flour, flax, bran, and dry spices; stir to incorporate. Stir in tvp. In a measuring cup, measure out water; add liquid smoke directly to the cup and stir, if using (this way the smoke will be evenly distributed). Stir in other liquid ingredients, then add wet to dry; mix well. With your hands, form mixture into 2" balls and flatten slightly into patties. Fry in oil in an uncovered frying pan on medium heat, about 2 minutes per side (or until browned). Freeze leftovers (if you have any) and microwave 1-2 minutes to enjoy on busy weekday mornings.