Gradually add water until the batter is the consistency of a thick cream sauce.
Lightly grease the 2 sides of a krumkake iron with cooking spray or melted butter.
Heat over medium to medium-high heat until a drop of water sizzles on the surface.
Spoon a heaping tablespoon of the batter into the center of the iron. Squeeze the sides closed enough to spread the batter, but not so much it overflows the sides. (Keep a damp towel nearby to wipe off any drips. Because of the butter content, you may accidentally get krumkake flambé if you're not careful!).
Bake 30 seconds, flip over, and bake 30 second more.
Flip iron to original position. remove krumkake, and shape over a krumkake cone or a wooden spoon. Slip off cone and allow to cool on a rack.