PreparationFor lamb: Combine garlic, oil, and oregano in large bowl; whisk to blend. Add lamb, sprinkle with 1 teaspoon coarse salt and freshly ground black pepper, and toss to coat. Cover and chill 1 hour. DO AHEAD: Can be made 1 day ahead. Keep refrigerated, tossing occasionally. For salad: Char peppers directly over gas flame or in broiler until blackened on all sides. Enclose in paper bag and steam 10 minutes. Peel, seed, and coarsely chop peppers. DO AHEAD: Can be made 1 day ahead. Wrap and chill. Place eggplant in large colander. Sprinkle with salt and toss to coat. Let stand 30 minutes. Rinse eggplant; drain well and pat dry. Heat 3 tablespoons oil in large nonstick skillet over medium-high heat. Add eggplant to skillet and sauté until tender, about 5 minutes. Remove skillet from heat. Add lemon juice, capers, oregano, roasted peppers, and remaining 1 tablespoon oil to eggplant and toss to combine. Season to taste with salt and pepper. Transfer salad to large bowl. Prepare barbecue (medium-high heat). Thread lamb cubes onto 6 long metal skewers, dividing equally. Grill lamb until cooked to desired doneness, turning skewers occasionally, about 10 minutes for medium-rare. Add arugula to eggplant salad and toss gently to combine. Serve lamb spiedini with salad alongside.
PreparationFor lamb: Combine garlic, oil, and oregano in large bowl; whisk to blend. Add lamb, sprinkle with 1 teaspoon coarse salt and freshly ground black pepper, and toss to coat. Cover and chill 1 hour. DO AHEAD: Can be made 1 day ahead. Keep refrigerated, tossing occasionally. For salad: Char peppers directly over gas flame or in broiler until blackened on all sides. Enclose in paper bag and steam 10 minutes. Peel, seed, and coarsely chop peppers. DO AHEAD: Can be made 1 day ahead. Wrap and chill. Place eggplant in large colander. Sprinkle with salt and toss to coat. Let stand 30 minutes. Rinse eggplant; drain well and pat dry. Heat 3 tablespoons oil in large nonstick skillet over medium-high heat. Add eggplant to skillet and sauté until tender, about 5 minutes. Remove skillet from heat. Add lemon juice, capers, oregano, roasted peppers, and remaining 1 tablespoon oil to eggplant and toss to combine. Season to taste with salt and pepper. Transfer salad to large bowl. Prepare barbecue (medium-high heat). Thread lamb cubes onto 6 long metal skewers, dividing equally. Grill lamb until cooked to desired doneness, turning skewers occasionally, about 10 minutes for medium-rare. Add arugula to eggplant salad and toss gently to combine. Serve lamb spiedini with salad alongside.