It's at times like this that I thank my lucky stars we have a brazier. Braziers have existed since ancient times--portable boxes or cylinders that can burn wood, charcoal, or other fuel and provide a small cooking space without the hassle of a full fire. In the eighteenth century, they were a natty campaign accessory for officers.
Reproduction brazier--ours looks a lot like this. However, most originals I've seen follow the cylindrical pattern below. The repro doesn't include the ash recepticle the two below have beneath the containers, and has a grill as a cooking surface, whereas the others require a cooking surface placed over them.
We set one up with charcoal under the shelter of a dining fly, and can cook up sausages, fry eggs, heat washwater--it's all we need unless we're planning for very large dishes like huge kettles of stew or a roast. And with this heat, who wants stew anyway?