With this simple recipe for long cooking pot roast, you can simply turn on your crockpot in the morning, be away all day, and come home to a fabulous and hearty complete dinner. Big cuts of beef will most likely always take a long time cooking in the slow cooker. The tough cuts such as top round and chuck have lots of connective tissue that does not break down until the meat temperature reaches around 200 f. While a steak would be inedibly tough at that temperature, a roast becomes meltingly tender and succulent. Use additional vegetables in this easy recipe. Use slices of red, yellow, and orange bell peppers, fresh green beans, parsnips, turnips, and celery, and add some healthy greens and veggies to this meaty preparation.