1 – 473 mL (16 oz) Dark Beer ¼ cup Brown Sugar 2 Tbsp Unsalted Butter ¼ cup Maple Syrup (optional)*
Using a heavy bottom sauce pan, over med-high heat, bring beer and brown sugar to a boil while stirring regularly. Turn heat to med-low and allow beer to reduce until mixture thickens to a syrupy consistency, about 35 minutes.
Remove from heat and mount sauce with cold butter until all the butter melts. (This will give your syrup a beautiful velvety sheen.)
*Brown sugar gives this recipe enough caramel sweetness without adding the maple syrup but adding a splash of syrup can round the flavours off quite nicely.