Switch on the slow cooker. Add half a litre of boiled water, and leave it to heat while you prepare the ingredients.
In a frying pan, lightly brown the steak, which should only take a few minutes to do, then put the steak into the slow cooker.
Lightly fry the onions and leek in a frying pan. I add the carrots for about 30 seconds.
Add the vegetables to the slow cooker, along with the sliced potatoes, and another half litre of water.
Leave to simmer for 8 hours on slow.
Thicken gravy if necessary using bisto or cornflour.