Wash plums and pat dry. Cut plums in half or smaller; pit. Place plums in aging container. Pour sugar over plums, stir. Add vodka and brandy stirring to partly dissolve sugar. Cap container and place in a cool, dark place for 2 months, stir occasionally. Place a strainer over large bowl and strain liqueur. Press liquid from plums with the back of a wooden spoon. Discard plum pulp. Re-strain liqueur through cloth until clear. Bottle as desired. Ready for drinking or cooking but best if aged another month.