- 1/2 cup dry white wine
- 1/4 cup extra-virgin olive oil
- 8 garlic cloves, peeled
- 4 tablespoons fresh oregano leaves, divided
- 3 tablespoons ancho chile powder
- 2 tablespoons fresh lemon juice
- 2 green onions, divided
- 1 tablespoon (packed) dark brown sugar
- 2 1/2 teaspoons coarse kosher salt
- 2 1/2 teaspoons freshly ground black pepper
- 1 4 1/2-pound boneless leg of lamb, opened flat like a book, trimmed of all fat and sinew (3 1/2 pounds after trimming)
- Combine wine, oil, garlic, 3 tablespoons oregano, ancho chile powder, lemon juice, 1 green onion, sugar, salt, and pepper in blender. Blend mixture until smooth. Transfer marinade to 13 x 9 x 2-inch glass baking dish. Add lamb and turn to coat evenly. Cover dish tightly with plastic wrap and refrigerate overnight.
- Prepare barbecue (medium heat). Grill lamb with some of marinade still clinging to surface until lamb is cooked to desired doneness, 15 to 16 minutes per side for medium-rare (130°F). Transfer lamb to carving board. Let lamb rest 15 minutes.
- Meanwhile, finely chop remaining green onion and 1 tablespoon oregano leaves; combine in small bowl.
- Thinly slice lamb across grain. Arrange lamb slices on platter. Pour over any accumulated juices. Sprinkle with onion-oregano mixture and serve.
- Available in the spice section of many supermarkets and at Latin markets.