Mix flour and salt in a large bowl.Add water gradually by adding in â…“ - ½ of the total amount each time, stirring well after each addition.Add the egg or substitute.Cover batter and refrigerate for 1-2 hours (optional. I've, opted not to do this when I am in a hurry. For best nutrition, soak the buckwheat mixture prior to adding the egg.)Ladle batter onto a prepared skillet, greased as necessary.Cook until galette starts to brown.Flip galette over and cook on the other side.