128 oz (1 gallon) apple cider (unfiltered apple juice NOT alcoholic cider)
32 oz (1 quart) 100% cranberry juice, not from concentrate
¾ cup sugar
1 tbsp angostura bitters
4 cinnamon sticks
½ tsp allspice berries
1 whole orange studded with cloves (20-25 cloves total)
Add all to slow cooker and set on low. Let cook, uncovered, for 8-10 hours, then serve -- it should be steaming hot.
Optional: Add 1.5 ounces of good quality aged rum (like El Dorado 12 Year) directly to a mug, then ladle 5-6 oz of wassail over top. Alternately, I like a combination of 1 oz aquavit and .5 oz Cointreau for a little more zip.