You can make homemade browning sauce if you're unable to purchase it. Add 1 cup packed brown sugar to a saucepan over medium-low heat and stir with a wooden spoon until it begins to melt and turn syrupy. If it starts to smoke, remove it from the heat temporarily to allow it to cool. Once the sugar is dark and syrupy, off the heat, add about ½ cup boiling water in a slow, steady stream, stirring constantly. Cool completely and then store in an airtight container in the refrigerator until you're ready to use it.