An autonoumus grill

A totally autonomous, mechanical, steam-powered grill! If the temperature of the coals increases, the pressure in the tank rises and the grillage spirals upward. If the temperature falls, the grillage lowers itself, so there is always the perfect temperature for your food. 

So don't bother any longer to maintain the coal at a constant temperature, just lean back, enjoy a beer, have a good time and let Alchemist do all the work for you!