What is your tried and tested way of knowing that your roast chicken is cooked?

I mean, without leaving it in the oven for 4 hours and ending up with a sparrow instead of a meaty chicken. I am completely obsessed with making sure the chicken cooks properly and thoroughly, I was VERY ill once thanks to an undercooked chicken breast and since then, I'm almost neurotic about it. Got any tried and tests tips on how to know when it's cooked?

I know about making sure the juices run clear etc and of course, making sure that it has cooked for the suggested about of time per lb/minutes
 
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