A mixture of cranberry, orange, and lemon juice steeped with cinnamon, cloves, allspice, and ginger.
Combine juices in a nonreactive pot and stir in 1/2 cup sugar. Taste the mixture to determine if more sweetener is needed and adjust according to your taste. Heat just until steam begins to rise from the mixture.
Combine the spices, zest, and ginger in a piece of cheesecloth. Gather the edges and tie them together so the spices can't fall out.
Drop sachet bag into steaming cranberry juice mixture. Press the sachet down into the juices. Continue to heat wassail without boiling for 5-7 minutes. DO NOT BOIL. Cover pot with a lid and allow to steep for 20 minutes. Remove lid and sachet. Serve.
Wassail can be made in advance and refrigerated. Reheat and serve. Can be made at least 1 week in advance.