Place everything in large saucepan, bring the mixture to a boil, lower the heat to maintain a steady simmer, and reduce the sauce down to about 1 1/2 cups. Strain out the solids. The dressing will be quite syrupy — a bit thinner than maple syrup. The dressing can be stored in a glass jar in the refrigerator for a month; it can also be frozen and thawed overnight in the refrigerator.