Chop the potatoes into chunks and rinse in cold water until water runs clear to remove starch, then put on the heat, once boiling, add salt and leave to boil until soft for about 30 minutes.
Pre heat oven to 190c / Gas mark 5. Heat 1 - 2 tbl spoons olive oil gently in a pan and add in onions and garlic - fry off for 3-4 minutes until they start to brown
whilst doing this part boil the carrots (about 10 min). Add the lamb mince to the onions and add salt and pepper. Crumble the lamb stock cube into the pan, add basil according to taste.
Fry off until lamb is browned and then add the peas and mushrooms. Drain off the carrots and add them. Add 2 tbl spoons gravy granules into the pan and a little water.
Add a good splash of worcester sauce - [b]this is the key ingredient![/b]
stir well and leave on a low light to cook, taste and add more seasoning if needed. Drain the potatoes and add a knob of butter to the pan, add milk if you want to change the consistency and mash until smooth. Place the lamb into an oven proof dish and place the mashed potato over the top, smooth over until lamb is covered - use a of a fork to decorate the mash.
Sprinkle with breadcrumbs
Bake in the oven for a further 10 minutes..