Let’s cook beef in slow cooker. Optional – start by browning your beef roasting joint with olive oil and salt and pepper. Brown on all sides. Note we have a slow cooker that lets you use the cooking pot on the stove. (we have this slow cooker)
Next peel your potatoes, carrots, and onion. Dice your carrots and onion and then chop your potatoes into the size of roast potatoes.
Decorate the potatoes, carrots, and onion around the beef joint. Then season the potatoes, carrots, and onion, with half the seasonings and place the beef stock cubes (still frozen) over them. Then add the tomato puree over the beef joint (and the remaining seasonings) smothering the tomato puree over the top.
Then place the lid on the slow cooker, and slow cook on high for 4 hours or for a more medium roast beef opt for 3 hours. Halfway through mix with a silicone spoon the potatoes and carrots and onions to mix them into the defrosted stock and to stop them from sticking.
When the slow cooker is done, remove the roast beef and allow it to rest before serving with the potatoes and carrots.