Roast leg of lamb with garlic and lavender recipe

Ingredients

• 1.5 kg leg of lamb
• 1 garlic bulb, unpeeled and halved horizontally
• 8 lavender sprigs, flower heads only
• 150 ml olive oil
• 6 garlic cloves, peeled and halved
• 2 shallots, unpeeled and halved
• 1 pinch sea salt
• 1 pinch freshly ground black pepper