Brown the beef chuck in a large saucepan.
500 g Diced beef chuck
Seal the lamb mince in the same saucepan.
250 g Lamb mince
Add diced onions and sliced carrots, then cook until softened.
2 Onions, 2 Carrots
Mix in tomato puree and cubed potatoes.
4 Potatoes, 2 tablespoons Tomato puree
Pour in the beef stock and bring to a simmer.
1 liter Beef stock
Cover the saucepan and let it simmer for about 2 hours until the beef is tender and the potatoes thicken the scouse.
Add the sliced leek, black treacle, and wholegrain mustard for extra flavor.
1 Leek, 1 tablespoon Black treacle, 1 tablespoon Wholegrain mustard
Simmer for another 10 minutes to allow the flavors to meld.