For the Lamb:
Pre-heat the oven to its highest setting.
Remove the lamb from the fridge half an hour before cooking.
Melt the Lurpak® Slightly Salted Butter and add the garlic, rosemary and lemon zest. Rub over the lamb and season with salt and black pepper.
Cook the lamb for 30 minutes on 240°c / 220°c fan / gas mark 7 and then turn the oven down to 160°c / 140°c fan / gas mark 3.
Cook for 1hour if you like your lamb pink. If you like it well done, add another 15 minutes. Remove the lamb from the oven and rest for 20 minutes. When your lamb is resting, make the herb, caper and lemon butter sauce.
For the Herb, Caper and Lemon Butter Sauce:
In a small saucepan, melt the Lurpak® Slightly Salted Butter gently over a low heat. Roughly chop the herbs and add to the Lurpak® Slightly Salted Butter with the garlic, lemon zest and juice, capers and anchovies. Season with salt and fresh ground black pepper. Keep warm so the sauce does not solidify and serve with the lamb.