Add onion, carrot, Guiness, vinegar and pickling spice to the venison in the slow cooker.
Barely cover the roasts with water.
Start slow cooker on high, once the liquid is bubbling, reduce heat to low. Cook on low for about 5 hours (depending on the size of the roast) until venison is very tender. (About 185°F internal temperature)
The Guiness and malt vinegar are very important, I have tried this without them and the quality is poor! Add potatoes, rutabaga, cabbage and carrots to make corned venison and cabbage or slice for Reubens!
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Notes
Can substitute corned beef.See recipe for Pickling Spice hereHow to Cure Venison for Corned VenisonDo not skip the Guiness Stout! It is not the same dish without it!Cook venison to 185-190°F.Leftovers will keep, refrigerated for 3-4 days.Leftovers can be frozen for longer storage, up to 1 month.