I usually cook a 3lb. chuck roast for 45 minutes under pressure using 3 cups of beef broth and a packet of brown gravy sprinkled on the meat. After 45 minutes I release the pressure and add the veggies...carrots, potatoes, celery, and mushrooms. Once pressure comes back up,,cook for another 20 minutes. Enjoy the most tender, juciest pot roast you've had.