Rub the surface of the roast evenly with salt, pepper and garlic.
Melt the ghee or coconut oil in a large skillet over high heat; add roast and sear on all sides till evenly browned (less than a minute per side); transfer to a large slow cooker.
Add remaining ingredients to the skillet and whisk up all of the browned bits from the bottom of the pan; pour mixture over the roast in the slow cooker.
Cover and cook on LOW for 8 to 10 hours.