How long do you cook a 1.1kg leg of lamb for?

The cooking time for a 1.1kg leg of lamb will depend on the cooking method and the desired level of doneness. Here are a few general guidelines:

Oven-roasting:

For a medium-rare lamb, roast the leg of lamb in a preheated oven at 200°C (390°F) for about 1 hour and 15 minutes, or until the internal temperature reaches 55-60°C (130-140 °F).

For a medium lamb, roast for about 1 hour and 30 minutes, or until the internal temperature reaches 65°C (150°F).

For a well-done lamb, roast for an additional 15-20 minutes, or until the internal temperature reaches 75°C (170°F).

Note: These times are approximate and may vary depending on the actual size and shape of the leg of lamb, as well as the accuracy of your oven's temperature gauge. It is always a good idea to use a meat thermometer to ensure that the lamb is cooked to your desired doneness.