Roast Leg Of Lamb With Rhubarb Mint Chutney

• 1 leg of spring lamb
• 1 lemon zest
• 1 onion
• 400 gr rhubarb
• 130 gr granulated sugar
• 60 ml lemon juice
• 16 ml vegetable oil
• 14 gr butter
• 1 gr mint (dried)