Preheat your oven to 325 F.
Melt some cooking fat in a Dutch oven that’s placed over medium-high heat. Brown the bison cubes, then remove them and set them aside.
Paleo cooking fat, 2.5 lb. bison meat
Brown the onion and the oxtail or beef shank in the same Dutch oven for about 4 min.
2 onions, 2 pieces of oxtail or beef shank of about 4 oz. each
Return the bison cubes to the Dutch oven. Add the red wine, and cook until the liquid is reduced by about half.
1 cup of dry red wine
Add the beef or veal stock, garlic, tomatoes, cinnamon, allspice, and tomato paste, and season with salt and pepper to taste.
5 tomatoes, 2 ½ cup beef or veal stock, 1 tsp. ground allspice, ½ tsp. ground cinnamon, 3 garlic cloves, 2 tbsp. tomato paste, Sea salt and freshly ground black pepper
Bring everything to a boil then cover and place in the oven.
Cook for 2 hours or until the bison cubes are tender.