A day ahead:
Mix the curry paste with 2 tablesp. of the oil and the garlic, spread it over the lamb, cover and leave in the fridge overnight.
To roast or barbecue:
Set the oven to Gas Mark 6, 200ºC (400ºF) / heat or light the barbecue.
Heat a large pan, place the lamb on the hot pan, season and brown well on both sides then place on a roasting dish and cook for 45 mins. approx for pink lamb.
Place the lamb on the hot barbecue and cook for 20/25 minutes approx. on each side over a medium heat.
Mix the yoghurt with 2 tablesp. mint, 1 tablesp. oil and seasoning.