Line slow cooker with slow cooker liner or parchment paper, if desired.
Add vegetables and meat to slow cooker. Season meat with spices, and pour red wine and orange juice over everything.
Cook overnight on low for about 10 hours.
Let cool for 1-2 hours before freezing with the liquid. While you can, you don’t have to slice before freezing as it will be moist and easy to cut when reheating.
Notes
How to Use Your Slow Cooker to Sauté All Your Onions: If anyone offers (!) to help you, give them the job of peeling and slicing a bunch of onions (like 10-12 at a time). Leave them in the slow cooker overnight with 1-2 tbsp of olive oil, and voilà, you have your own pre-packaged sautéed onions. Freeze them in snack-size Ziploc bags or freeze them in an ice cube tray and you can pull them out one at a time, as needed.