Combine all ingredients in a slow cooker. Cook on Low for 3 hours. Serve warm (though it tastes great chilled, too). Store covered in slow cooker.
If you want to keep the cranberry wassail in your crockpot for longer than one day, then every 24 hours or so you should heat it on Low for 1 hour, then add 2 cups of Cran-apple juice, ¼ cup of orange juice, and a little squirt of honey. Adding some fresh juice each day brightens the flavor up, while the mulled juice and whole spices add nice complexity. You can double or triple the amount of juice you add each day, if needed.
After about 2 weeks, the wassail won’t taste as good anymore, so it’s time to throw out what’s left and start a whole new batch.
Notes
I’ve never made this wassail on the stove, but I’m sure you could do that by simmering it on low for an hour, storing it covered, and then simmering it for a minute or two each day and adding extra juice and honey as instructed above.
Recipe by I Wish I Was a Muffin at https://iwishiwasamuffin.com/crockpot-wassail/