After much experimenting and gallant taste-testing by friends, the best ever sugar-free vegan brownies have finally been perfected! Crispy toffee-chewy on the outside and gooey soft on the inside. In case you like even more chocolate in your brownies, try adding a couple of tablespoons of cocoa nibs into the dry ingredients - these will give the brownies a rich, dark chocolate flavour. You might like to try substituting the pecans for almonds. Makes 12 brownies (11 cm x 3 cm x 2 cm pan).