Cut kumquats into halves and remove seeds. Puree kumquats in a food processor.
Preheat the oven to 350 F (180°C).
In a medium sized bowl, combine spelt flour, oat flour, flaxmeal, salt, baking powder, and spices.
In a large bowl, combine milk, egg, olive oil, vanilla extract, and brown sugar.
Add the flour mixture and stir until well mixed.
Fold in the pureed kumquats and walnuts.
Pour the batter into a greased 9-inch x 5-inch loaf pan and sprinkle the top with gold shimmer sugar.
Bake for 1 hour or until a toothpick inserted comes out clean.
Cool and remove from pan.