Place 1 and 1/2 cups buckwheat in blender and whiz until a fine flour is reached.
Put buckwheat in a bowl and cover with 5 inches of water. Soak over night. In the morning drain and place on a baking tray. Spread thinly. You might need two trays. Place in dehydrator and dry at 50C for 8 hours or overnight. When dry blend to a fine flour.