Place thawed roast(s) in the bottom of the crock pot and season generously with Smokey Citrus Seasoning or Coffee Rub. Salt & pepper can also be used. Add 1/4 cup of water.
Cut onion into thick slices and peel garlic cloves then place around the roast in the crockpot. Add a sprig of fresh thyme or rosemary if desired.
Halve or quarter potatoes and cut carrots into 2 to 3” sections then layer on top of the roasts. If using sweet potatoes peel first.
Turn crockpot to low and cook with the lid on for at least 8 hours. The longer it cooks the more tender it will be.