Recipe of the day: Amasi-marinated deboned leg of lamb with chimichurri

1. Lay lamb flat on chopping board, skin-side down.
2. Using a sharp knife, make an incision halfway into the flesh on each side where the meat is thicker and open it out to look like an open book. This will give you a flat piece of lamb of more or less the same thickness.
3. Mix amasi with garlic and rosemary and pour into a large zip-seal bag. Slide butterflied lamb in and seal.
4. Massage well and refrigerate for at least 3 hours.
5. Remove from fridge at least 1 hour prior to cooking, so  lamb comes to room temperature and cooks evenly.
6. Take lamb from bag and wipe away excess marinade. Reserve remaining marinade.
7. Season lamb with salt and pepper.
8. Combine basting ingredients.
9. Prepare medium hot coals – you should be able to hold a hand above the grid for 8 seconds.
10. Cook the meat fat-side down over medium-hot coals until nicely browned, basting from time to time.
11. Cook the meat for 40-45 minutes in total, or until medium rare (internal temperature in the thickest part must register 57°C; 62°C after resting) or until preferred doneness.
12. Transfer to a warm platter and rest for 15 minutes, covered  loosely with foil.
13. Slice thinly across the grain (in the opposite direction of the meat fibres) and serve with chimichurri.

For the chimichurri  

1. Combine red onion, garlic, vinegar and lemon juice in a small bowl and  leave to marinate for 10 minutes.
2. Transfer to a jug blender and add parsley, coriander, oreganum and chilli, and blitz until finely chopped.
3. Add the oil slowly while continuing to blend on slow speed.
4. Add salt and pepper. Blitz to combine.
5. Store in a jar in refrigerator for later use. Sauce can be made up to 3 days in advance.