A chuck roast is typically psyched on a long day in a crockpot w/ root veggies like, carrots, onion, potato. - To hasten 'defrost' you could throw it in a large basin/bowl of water while inside that packaging. --- Then you can sear with olive oil and garlic on outside if you want...and then put in crockpot with a lipton soup packet recipe, or a stock, or custom concoction/seasoning --- options... But in a crockpot w/ veggies is prolly gonna work out. -- Enjoy!