Give this a try, I had it last Sunday & thought it turned out great.
This recipe is out of Jim Zumbo's Amazing Venison Recipes cookbook.
Easy Venison Roast
3-pound venison roast
1/2 medium onion sliced
2 celery stalks chopped
1/2 cup ketchup
1/3 lemon juice
1/2 teaspoon Worcestershire sauce
1/2 teaspoon A-1 sauce
1/4 teaspoon salt
1/4 teaspoon garlic salt
1/4 teaspoon pepper

Place Roast in crock pot or slow cooker. Add all ingredients and simmer 6 to 8 hours or until tender. Serves 6 to 8.