Preheat your oven to 200°C/Fan180°C/Gas 5.
To make the lamb hot pot, bring a medium sized pan of water to the boil, add the potato slices and cook for five minutes on a medium-high heat, drain and leave to cool. In a large pan add one tbsp of the rapeseed oil and cook the onion, carrot and leek until they start to colour over a medium heat.
Now add the cooked lamb and continue cooking for 2-3 minutes before stirring in the flour. Deglaze with the Worcestershire sauce then pour in the lamb stock and bring to a steady simmer, add the rosemary, leave it ticking away and season to taste.
Now heat up the last of the olive oil in a large frying pan and cook the sliced blanched potatoes until they start to turn golden.
Pour the cooked lamb into a medium sized ovenproof dish, top with a layer of potato, place in the oven and cook for 10-15 minutes. This is perfect with pickled red cabbage or any vegetable of your choice. You can also serve it with crusty bread to mop up the delicious sauce.
Cook's Tip: If you had a lamb leg for your Sunday roast, you'll also have some lamb bones, which you can boil to make a delicious stock (use it to make everything from lamb pilau to harira, a Middle Eastern soup, or even this leftover meat recipe again).