Place 2 Tablespoons salt, 1/4 cup vinegar, and sliced garlic into a large bowl. Stir. Add antelope roast, and cover with water.
Cover bowl tightly with plastic wrap or a lid, and let meat marinade for 8 hours or overnight.
Drain meat, discard marinade. Rinse meat and place in crockpot.
Add ½ cup water, tomatoes, gravy mix, onion, mustard, and salt. Cook on low for 10-12 hours.
Shred meat and stir back into sauce. Serve over potatoes or pasta.
You can skip the marinade step if you don't have the time - the recipe will work fine. Marinading is mainly to reduce any gamey flavor in the meat.Stir the sauce ingredients together and spoon some over meat before cooking, so it gets soaked with flavor.