Try a cheap popcorn popper - more or less a heat gun with an aluminium cup attached. I've used one for roasting coffee with good results. The thing keeps the be

Try a cheap popcorn popper - more or less a heat gun with an aluminium cup attached. I've used one for roasting coffee with good results. The thing keeps the beans in motion while roasting them, all you have to do is switch it on and off at the right moment.