I cook Venison in a similar manner in a camp oven. I add the garlic as he does wrap in bacon a little bit of oil on the bottom. place roast in sear bacon, add vegetables and half a stubbie of beer. Lid on and colas on lid. Come back latter turn roast add more beer, softer veg, like peas, tomatoes and mushroom etc add various soup powders to thicken liquid, lid back on. Short time latter eat a meal fit for a king. Left overs are left in the camp oven and had cold for lunch or dinner next day, beautiful.