Butterflied leg of lamb with Mexican-style marinade
Lay the lamb flat on a chopping board, skin-side down. With your knife, make an incision halfway into the flesh on each side, where the meat is thicker, then open it out like a book. You should now have a flat piece of lamb of more or less even thickness.
In a large bowl, mix the spice paste with the lemon zest, paprika, oil, vinegar and a pinch of sea salt. Pick in the oregano leaves, peel and crush in the garlic, then finely slice and stir through the chilli until combined.
Remove from the fridge at least 30 minutes before you're ready to cook, so the lamb comes up to room temperature. Fire up your barbecue, then once hot, cook the meat for 40 to 45 minutes, or until medium-rare, turning it every 10 minutes or so.
Ancho chillies are dried poblano chillies, used in Mexican cuisine.