Roast leg of lamb

Ingredients

• 1 whole lamb leg (about 2-3 kg)
• Marinade: 3 tbsp cumin powder
• Marinade: 2 tbsp chili powder
• Marinade: 1 tbsp five-spice powder
• Marinade: 4 cloves garlic (minced)
• Marinade: 2 tbsp soy sauce
• Marinade: 1 tbsp salt
• Marinade: 1 tbsp sugar
• Marinade: 2 tbsp vegetable oil
• Marinade: 1 tsp Sichuan peppercorn powder
• Garnish: scallions
• Garnish: lemon wedges