For the Greek Lamb Gyros: - 1.5 pounds boneless lamb shoulder, thinly sliced - 1/4 cup olive oil - 2 tablespoons lemon juice - 4 cloves garlic, minced - 1 teaspoon dried oregano - 1 teaspoon dried thyme - 1 teaspoon dried rosemary - Salt and pepper to taste - Pita bread - Sliced tomatoes - Sliced onions - Lettuce For the Tzatziki Sauce: - 1 cup Greek yogurt - 1/2 cucumber, grated and squeezed to remove excess moisture - 2 cloves garlic, minced - 1 tablespoon fresh dill, chopped - 1 tablespoon lemon juice - Salt and pepper to taste