1. Preheat oven to 180 degrees Celsius. Sift the self-raising flour, baking powder, and salt, then add in the sugar, bran, and nuts and mix well with a wooden spoon.
2. Measure the margarine, add in the flax egg, boiling water, canola oil, and vanilla.
3. Make a well, pour in the wet into the dry, and rub the butter mixture into the flour mixture until a smooth batter starts to form, press the batter into the rusk tray of choice, sprinkle more sugar on top, and bake for 35-40 minutes until golden.
4. Once baked, let it cool, slice into fingers, and then dry out at 100 degrees Celsius for 1-2 hrs.
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