Instructions

  1. Line a 8 x 4 inch loaf pan with parchment paper and set it aside.
  2. Whisk whole wheat flour, all-purpose fluor, sugar, baking powder, baking soda, and salt together in a large bowl.
  3. Combine orange rind, orange juice, egg, and vegetable oil in a separate bowl; add to flour mixture.
  4. Sprinkle with rhubarb and walnuts (if using).
  5. Stir until moist but still lumpy.
  6. Scrape into prepared pan.
  7. Bake in centre of a preheated 350 degree Fahrenheit oven about 1 hour, or until a tester inserted into the centre comes out clean.
  8. Cool in pan on a rack for 10 minutes.
  9. Remove from pan and cool.
  10. Serve within 24 hours.