Ingredients

• 4 cups all-purpose flour
• 1 cup butter, melted
• 3/4 cup white sugar
• 1/4 cup lukewarm milk
• 1 egg
• 2 (.25 ounce) packages active dry yeast
• Filling:
• 1 1/2 cups treacle (golden syrup)
• 1 1/3 cups soft brown sugar
• 1/4 cup butter
• 1 teaspoon ground cinnamon

Instructions

1. Combine flour, 1 cup melted butter, white sugar, milk, egg, and yeast in a large bowl. Knead until dough is smooth and elastic. Cover loosely with plastic wrap and let rise, about 45 minutes.
2. Heat treacle, brown sugar, 1/4 cup butter, and cinnamon in a small saucepan over medium heat until melted together, 3 to 5 minutes. Mix well until filling is smooth.
3. Preheat a shallow waffle iron according to manufacturer's instructions.
4. Knead dough briefly and divide it into balls about 1 1/2 inches in diameter, or as needed to fit your waffle iron.
5. Bake 1 ball of dough the preheated iron until golden brown and iron stops steaming, 30 seconds to 1 minute. Remove with a cake spatula. Press down with a round cutter to trim edges for a perfect circle. Carefully slice horizontally into 2 rounds while still hot. Spread 1 to 2 tablespoons of the filling on each round and sandwich together. Repeat with remaining dough.