Spray a 9 x 5" loaf pan with nonstick spray and preheat the oven to 350 F.
3
Whisk together the dry ingredients (flour through brown sugar) in a large bowl.
3
Combine the flax seeds with the water. Let stand for about 10 minutes.
4
Whisk together the remaining wet ingredients (oil through vanilla), add the flax-water mixture and mix well, then stir gently into the flour mixture.
5
Stir just until all traces of flour disappear, then fold in the raisins and walnuts. Spread evenly in the pan and bake for about an hour, or until a toothpick comes out clean. Cool in the pan for about 5 minutes then remove from the pan and transfer to a wire rack to cool completely.