Mix all the ingredients other than lamb into a blender and taste. Add any flavor you feel is lacking.
Marinate the lamb in half of the sauce in a dish to be put in the oven for at least 1 hour. Cover well and leave at room temperature.
Set oven to 450. Uncover and cook lamb for 15 minutes with the fat face up and flip and cook for another 10.
Take and cover. Leave cover for 10 minutes before cutting. Serve with other half of the sauce for dipping.