Preheat the oven to 190C / 375 F.
Put the potatoes in cold water, bring it to the boil and cook them until tender, then drain.
Season the lamb, then in a hot a frying, using olive oil, sear it. Move the lamb onto a plate.
Add the potatoes to the frying pan, then using a fork or masher crush the potatoes. Stir and fry for a couple of minutes
Slightly oil a deep roasting tin. Move the potatoes into the tin, then add the garlic, tomatoes, olives and rosemary leaves. Season then lightly mix.
Even out the mixture then put the lamb on top.
Pour the lamb juice over it, sprinkle with more rosemary and drizzle with oil.
Put the tin in the oven and roast it for about 30 minutes to your liking.
Before serving, slice the lamb into chops, then serve with the crushed potato mixture and perhaps some green salad