So it's now pretty much the hottest part of summer here in the Sierra de Grazalema and at this time of year lighting a flame barbecue outside is not only foolhardy it is actually against the law. The sierras are tinder dry and a spark can cause a big uncontrolled fire very easily... So what are we to do when we have some friends around to our country finca for an afternoon vegetarian barbecue, microwave? No, the answer to perfect summer outdoor cooking is a parabolic solar cooker... It's not rocket science. Reflect and concentrate the sun onto the base of a pan and you can cook just like on a regular hob.