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Heat the oil in a large pan and fry the leek, mushrooms, thyme, tofu and kale for about 5 mins. Add the mustard, tamari and half of the black beans and give it a good stir. Transfer the mixture to a blender and pulse a few times – don’t over-blend, it needs to be quite chunky in texture. Scoop into a bowl and add the rest of the black beans, the oat bran, rice and chopped nuts, then mix well.
Divide the mixture into 4-6 evenly sized portions and shape into patties using your hands. Tip the gram flour onto a plate, if using, then roll the patties in the flour to coat.
To make the burger dressing, mix all ingredients together in a bowl and set aside. Fry the patties for 4-5 mins on each side until crisp on the outside.
Slide the patties into the buns with the tomato, onion, lettuce and a dollop of burger dressing.