Place the millet and buckwheat in 1 ½ cups water in a medium bowl, loosely cover and let stand on the counter overnight (or at least 5 hours).
Drain, rinse and place the soaked grains in a blender (not a Vita-Mixer which makes the batter too fine and, therefore, more dense). With a spatula or clean fingers, level the grains. Add enough fresh water to just reach the top of the grains. Add coconut, egg, butter, honey, orange zest, cinnamon and salt. Process into a thick batter. Some millet will remain whole and this provides crunch. Pour the batter onto a hot waffle iron, sprinkle the top with sunflower seeds, close and bake according to the manufacturer's directions. Serve hot with your favorite toppings.
Note: Substitute whole oats for the buckwheat. Or substitute pecans or walnuts for the sunflower seeds. Do not add fruit to this waffle as fruit makes it too heavy and acidic and therefore hard to digest.