This is a delicious Dutch treat that goes well with afternoon tea or coffee. The recipe calls for treacle, which is a European ingredient similar to molasses. I used molasses, but it is bolder and darker-tasting than treacle. If you can't find treacle, and would like a milder tasting filling, golden molasses or sorghum syrup may be used instead.
Make the waffles: In the bowl of a standing mixer, combine the flour, butter, sugar, yeast, milk and egg. Knead with the dough hook attachment until you have a smooth consistent dough. This mixture can also be kneaded in the bowl by hand if you don't have a stand mixer. Transfer the dough to a greased bowl and loosely covered it with plastic wrap. Set it in a warm place to rise (it won't rise much) for 45 minutes.
Make the filling: Heat the treacle or molasses, brown sugar, butter and cinnamon in a saucpan over medium heat. Bring the mixture to a bubble. When the mixture thickens slightly and the sugar is melted, remove it from the heat.
Preheat a shallow waffle iron (such as a waffle cone, pizzelle, or stroopwafel iron) as directed by the manufacturer's instructions. Knead the dough briefly and divide it into balls the size of a tennis ball (adjust this according to the size of your waffle iron - mine took slightly more dough). Place the ball in the waffle iron and flatten it slightly, then close the lid to cook the waffles until no more steam escapes and the waffle is golden brown.
Remove the waffle carefully with a fork or spatula. Use a round cutter to cut off the edges to make a perfect circle. Carefully split the waffle into two rounds while still hot. Don't wait too long! They'll tear or break if you let them cool before cutting them.
Spread 1 to 2 tablespoons of filling on one of the halves and top with the other half. Repeat with remaining waffles.
Serve the waffles with tea or coffee. Store them in a container that seals air-tight.
Keyword active dry yeast, ground cinnamon, treacle