Step 1

A Norwegian heart-shaped waffle iron

Step 2

Whisk flour, sugar, and salt in a medium bowl. Whisk egg yolks, sour cream, vanilla, 1/2 cup butter, and 1/3 cup water in another medium bowl; add to dry ingredients and whisk until smooth. With an electric mixer, beat egg whites to stiff peaks and gently fold into batter.

Step 3

Heat waffle iron until very hot and lightly brush with butter. Working in batches, cook waffles until golden brown and crisp. Stack waffles and serve with desired toppings.