Now that temperatures are on the rise, the outdoor season is starting up again, too. For many nature fans around the world the summer would be incomplete without an essential piece of equipment: the solar cooker. It uses solar energy so that food can be warmed without electricity. This requires a reflective surface that is curved so as to form a concave mirror (1), which reflects the light rays that hit it (2). Fortunately, the beams of sunlight that reach the earth are nearly parallel to one another, allowing the parabolic mirror to bend them towards a focal point where all of the solar radiation is focused (3).

This concentration of sunlight means that the item to be cooked can be heated to really high temperatures, making it possible to boil, roast, bake or fry food (4). The solar cooker must be realigned with the sun’s position from time to time (5), otherwise the temperature will fall.