Preparation Mix 1 cup yogurt, 1 teaspoon Tabil Spice Blend, and 1 minced garlic clove in a small bowl. Season to taste with salt and pepper. Cover and chill. Whisk remaining 1 cup yogurt, remaining 3 1/2 tablespoons Tabil Spice Blend, 4 minced garlic cloves, 1 tsp. salt, 1 teaspoon pepper, oil, and lemon juice in a large bowl. Add lamb; turn to coat. Cover and chill overnight, turning occasionally. Prepare grill to medium-high heat. Season lamb with salt and pepper. Grill until meat is cooked to desired doneness, 10-15 minutes per side for medium-rare. Let rest 10 minutes. Meanwhile, grill lemon halves, cut side down, until charred, about 5 minutes. Thinly slice lamb against the grain and arrange on a platter; garnish with lemons. Serve with reserved yogurt sauce.
Preparation Mix 1 cup yogurt, 1 teaspoon Tabil Spice Blend, and 1 minced garlic clove in a small bowl. Season to taste with salt and pepper. Cover and chill. Whisk remaining 1 cup yogurt, remaining 3 1/2 tablespoons Tabil Spice Blend, 4 minced garlic cloves, 1 tsp. salt, 1 teaspoon pepper, oil, and lemon juice in a large bowl. Add lamb; turn to coat. Cover and chill overnight, turning occasionally. Prepare grill to medium-high heat. Season lamb with salt and pepper. Grill until meat is cooked to desired doneness, 10-15 minutes per side for medium-rare. Let rest 10 minutes. Meanwhile, grill lemon halves, cut side down, until charred, about 5 minutes. Thinly slice lamb against the grain and arrange on a platter; garnish with lemons. Serve with reserved yogurt sauce.