Preheat the grill to high. Put the tofu into a processor, and chop until very fine. Add the peanut butter, beans, coriander stems and plenty of seasoning then pulse to roughly chop the beans. Shape into four burgers.
Place the burgers on a non-stick baking tray and grill for five minutes on each side, until hot through and golden. Meanwhile, toss the radish, onion, apple and coriander leaves with the lime dressing.
Toast the flatbreads to warm through. Serve the burgers in the breads, each topped with one teaspoon of barbecue sauce and a spoonful of slaw, serving the rest on the side.
Cook’s tip: To make your own barbecue sauce, stir together one tablespoon of ketchup, one teaspoon of dark muscovado sugar or better still, molasses sugar, plus tastes shakes of Chipotle Tabasco (or to taste).