Kill a deer. Any deer should do, in this case it's a blacktail.
take a chunk of it's hind end, and make a marinade with some garlic, thyme, rosemary, parsley, sea salt, fresh pepper, olive oil and balsamic vinegar
Chop up the herbs and garlic, and add the vinegar an oil. Or put it all int he food processor and mulch up.
Chuck the roast in the marinade, and smear the paste all over it. Wrap it in plastic wrap and let it sit for a few hours or overnight.