Add the chickpeas, nutritional yeast, garlic powder, onion powder, thyme, coriander powder, sage, vegan chicken spice and dijon mustard to the food processor along with the vegan chicken stock and process until well mixed.
Pour this out into a mixing bowl and add the vital wheat gluten. Stir it in with a spoon and then almost immediately get in there with your hands to mix it properly and knead just a few times. You just want it to go from soft and sticky to just starting to become firm.*
Transfer to a cutting board and flatten it out before cutting into 4 pieces. Wrap these 4 pieces in foil (loosely, they expand while steaming) and place into a steamer and steam for 20 minutes.
When they have finished steaming, let them cool for a few minutes and then unwrap them from the foil.
Cut each piece lengthways down the middle so that you have 8 pieces.
Sprinkle them with vegan chicken spice and rub in with your fingers.
Heat some vegan butter in a pan and then fry the fillets in the butter, turning over regularly until browned and crispy on both sides. Depending on the size of your pan you will likely have to do this in two batches.
Serve with fresh parsley and fresh lemon, and a sprinkle of sea salt and black pepper.