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1
Finely chop up 1/2 of the garlic on a cutting board and sprinkle with a generous pinch of salt.
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2
Mash the garlic and salt together with the flat-side of a knife into a paste.
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3
Add the oregano and continue to mash until incorporated.
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4
Put the garlic-oregano paste in a small bowl, add the lemon juice and 1 cup of olive oil; season with salt and pepper.
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5
Slice the remaining garlic into thin slivers.
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6
Put the lamb on a large platter, and trim any excess fat.
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7
Cut the lamb in 1/2 lengthwise so you have 2 large pieces.
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8
Make slits all over the meat with a sharp knife, and push the garlic slivers inside.
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9
Rub 1/2 of the garlic-oregano paste all over the lamb and season the meat with salt and pepper.
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10
Roll up each piece of lamb lengthwise and tie with butcher's twine to hold the roasts together.
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11
Put the lamb on a large platter and slather with the remaining garlic-oregano paste.
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12
Marinate, covered, in the refrigerator for at least 1 hour or up to overnight.
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13
Preheat the oven to 375 degrees F.
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14
Wipe off the excess paste from the lamb so it won't burn in the oven.
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15
Place a large roasting pan over 2 burners on medium-high flame and coat with a fair amount of olive oil.
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16
Put the lamb roasts in the roasting pan and sear to form a nice brown crust on all sides.
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17
Transfer the pan (and lamb) to the oven and roast for 1 to 1 1/2 hours; it should be pink in the center and the internal temperature reads 130 degrees F. Allow the lamb to stand 10 minutes to let the juices settle before and slicing.
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18
Cut off the butcher's twine and thinly slice the lamb.
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19
Place the meat in the center of the pita breads.
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20
Top with lettuce, chopped tomatoes, and tzatziki.
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21
3 cups plain yogurt
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22
1 lemon, juiced
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23
2 medium cucumbers, peeled, halved, seeded and diced
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24
1 tablespoon finely chopped fresh mint leaves
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25
Kosher salt and freshly ground black pepper
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26
Put all the ingredients in a mixing bowl and combine with a fork.
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27
Refrigerate for at least 1 hour to allow the flavors to marry.