Originally Posted by ivanb
How long should I cook a 6lb roast (beef) on a chiminea for a 'medium to medium rare'
Is your chimnea cast iron? If it is, there should not be any reason why you can't cook in it, but as for the roasting time, it's debateable, because you are not roasting in a controlled oven temperature so there's no knowing. However, should you decide to, for your food safety, use a meat thermometer.