Sift or whisk together the bread flour, buckwheat flour, baking powder, baking soda, and salt in a large bowl. Mix the coconut milk, water, and brown sugar in a medium bowl. Pour the coconut milk mixture into the flour mixture and stir just until blended.
Pre-spray waffle iron with one coat of oil spray. Use exactly 1/2 cup batter on a 6-1/2 inch round electric wafflemaker. Cook 15 seconds past “done” on medium setting. Makes 8 (6-1/2 inch) round Belgian waffles. (Yielded 5 (7-inch) round Belgian waffles on Dave's waffle maker, using a little more batter for each.)
For a treat, drain a single-serving of Del Monte Cherry Mixed Fruit, layer the fruit on top of one waffle with Grade B 100% maple syrup, put another waffle and syrup above that, and cut the whole sandwich into 1" squares and eat.