Preheat oven to 325ºF (170°C).
Have ready 12 muffin cups with paper liners.
In a small saucepan bring to a boil 1 cup raisins and 1 cup water. Let it boil very slowly for about 15 minutes, until there is almost no water left. Process the raisins, as smooth or a bit chunky, whatever you like. You can also skip this step.
Toast 2 cups wheat bran for about 5 minutes in the oven, careful not to burn it. Move it around so it toasts evenly. It burns quickly if you don’t watch it, much like coconut.
In a large bowl mix ½ cup buttermilk with the ½ cup remaining water, the toasted bran, raisins, ½ teaspoon orange zest and ½ cup brown sugar. Mix well.
Add ½ cup coconut oil, 1 egg, 1 egg white and mix everything.
Stir in ½ cup all purpose flour, ¼ cup whole wheat flour, 1 teaspoon baking powder, 1 teaspoon baking soda (sifted) and ½ teaspoon salt. Mix quickly and only until no dry streaks remain. Do not overmix.
Divide between muffin cups and bake for about 25 minutes, until a tester comes out dry. They don’t raise much.
Let cook on a wire rack.