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1
Using the tip of a sharp knife, cut evenly spaced small slits about 1/2 to 1 inch deep all over the lamb.
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2
Insert pieces of garlic clove in the slits.
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3
You should have 20 or more slits.
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4
Place the salt, pepper, dried thyme, and dried oregano in a small bowl and stir to combine.
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5
Tear off a piece of aluminum foil large enough to completely wrap the leg of lamb and place it on a work surface.
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6
Arrange large piece of plastic wrap on top of it.
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7
Place the garlic-studded leg of lamb on top of the plastic wrap.
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8
Rub the herb mixture all over the leg of lamb.
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9
Arrange the lemon slices and stalks of rosemary all over the lamb, placing some underneath the leg and some on top.
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10
Wrap the lamb tightly with the plastic wrap, then with the aluminum foil.
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11
Refrigerate the lamb until ready to cook, at least 8 hours, preferably overnight.
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12
When ready to cook, unwrap the lamb and remove the lemon slices and rosemary sprigs and discard them.
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13
Rub the lamb lightly with olive oil.
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14
S. Preheat the grill to medium-high heat.
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15
Skewer the lamb on the rotisserie spit, if using, and grill according to the manufacturers instructions until cooked to taste, 1 3/4 to 2 hours.
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16
When done to medium-rare the internal temperature of the lamb will read 125F on an instant-read meat thermometer (take care not to touch the bone when inserting the thermometer).
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17
When done to medium-well the temperature will register 140F.
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18
You can also grill the leg of lamb on a medium-high grill over indirect heat, turning it often; it will be done after 1 3/4 to 2 hours.
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19
Remove the lamb from the rotisserie spit, if using, and place it on a platter to rest for about 15 minutes before carving.
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20
Or, let the lamb cool completely, wrap it in aluminum foil, and refrigerate it.
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21
Rewarm the lamb by opening up the foil on top and placing the lamb in a 350F oven for about 30 minutes before serving.
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22
Carve the lamb into slices.
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23
Garnish the platter with sprigs of fresh thyme, oregano, rosemary, if desired, and lemon wedges.
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24
Serve the Greek Chimichurri Sauce on the side.
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25
For the sauce:
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26
Place the onion, olives, mint, parsley, oregano, garlic, lemon juice, and salt in a food processor fitted with a steel blade.
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27
Process until finely chopped and well blended, about 1 minute.Taste for seasoning, adding more lemon juice as needed.
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28
Spoon the chimichurri sauce into a small glass bowl, cover it with plastic wrap, and refrigerate until serving time.