Mix condensed soup, water, and dry onion soup mix in a slow cooker. Place pot roast in the slow cooker and coat with soup mixture. Cook on Low for 8 to 9 hours or High for 3 to 4 hours.
It's not one for those who like a rare roast, but rather more for pot roast fans. Preheat the slow cooker to the lowest setting. Place a large, heavy-based frying pan over a high heat. Rub the oil ...
Transfer the browned chunks straight to the slow cooker pot. Repeat with the remaining oil and beef. Add the onion, gravy granules, mustard and stock cube to the pot and pour in 550ml/1 pint water.
Here are the main differences: Chuck roast comes from the shoulder, while rump roast comes from the hindquarters. Both areas are hard-worked, muscular parts of a cow, so they result in lean cuts.