Preheat your oven to 400F/200C. Roll out your puff pastry on a floured surface into a 1/4" thick rectangle. Brush with 2 tbsp. of melted butter, sprinkle with 4-5 handfuls (that's right, how is that for exact measurements!) of demerara/turbinado sugar, 4 tsp. of cinnamon and 2 tsp. of mixed spice.
Then roll the pastry from the narrow side.
Cut into 12 equal parts.
Then arrange on a buttered dish leaving 1/2"space between each bun.
Chill in the fridge for 20 minutes.
Bake in the preheated oven for 25-30 minutes.
Drizzle with caramel sauce.