this is a porter in the style before the creation of black patent malts. in this style a percentage of the first runnings were drawn off and boiled to a dark caramelized syrup and then added back to the boil to add color and caramel sweetness. so that will be a part of this recipie. after mashing is compleat (before sparge) take 3/4 of a gallon of first runnings and carefuly reduce to a dark syrup without burning. start the boil with the rest of runnings,sparge, hops and licorice. once the syrup is ready add it to the boil in the kettle.
side note, for this recipe also you need to steep the hops in 1q of 160•F water before adding, 30 min should be fine. when adding just throw all the hops and liquid into kettle. this is the way it was done in the later 1700s.