Melt butter and let it cool to room temperature.

In a large bowl, beat eggs and sugar together until light and fluffy.

Add vanilla extract, cardamom, cooled melted butter, and flour to the egg mixture.

Mix all ingredients thoroughly until a smooth batter forms.

Preheat your krumkake iron according to the manufacturer's instructions.

Place a teaspoon of batter onto the hot krumkake iron.

Close the iron and bake until the krumkake is golden brown, about 30 to 40 seconds.

Carefully remove the krumkake from the iron.

Immediately shape the warm krumkake into a cone using a wooden cone form, or roll it onto a stick.

Let the krumkaker cool completely to crisp up before serving.