OK, even I can roast a nice leg of lamb :D. However, at Christmas I am feeding lots of people and am likely to need 2 joints. If I buy 2 lamb joints, of approximately the same size and intend to cook them both in the same oven at the same time, will the cooking time be the same as for just 1 joint, or do I need to increase it? :help: No guesses please, only reliable addvice! Can't afford Xmas dinner to go pear shaped!

My guess is, I mean my reliable advice is . . . if you have a fan oven I wouldn't worry too much. Even though more heat will be absorbed by 2 joints, your oven thermostat will regulate the temperature and maintain the required heat needed to cook both joints at the same time as it would take to cook just one.

If you imagine cooking 1 yorkshire pudding, then imagine cooking 30, the time it takes would be the same. However, you may have to increase it slightly, not due to a loss of heat, but heat circulation. The heat circulating and cooking the one joint of lamb may be decreased due to the second joint of lamb laying close to it.

Imagine laying in bed next to your partner and the room catches fire. You will both essentially "cook" at the same time as if you were single. However, if you are laying back to back, your fronts will burn quicker than you backs. The same principle applies to cooking two joints of lamb.

O just wait for another answer.

Well, I'd never thought of it in those terms before, but I guess that makes sense! Only worry now is that on Christmas day I'll be gazing through the oven door, then suddenly have horror flashes of myself and OH being burnt alive!