Boil egg in cold water

An artist has a box with double bottom: one of them is perforated and mobile, so it is possible to put it out. Between these two bottoms he puts just a little bit of burnt lime. Then, take two eggs and smash one as a proof that they are crude. Also show to the audience that the dish is empty. Put cold water inside till ¾ of the dish is full, add the egg and cover the dish. Burnt lime starts to decompose, this will produce the boiling and within 5 minutes eggs are ready for consumption. This magic can be executed also in more interesting way. The artist can declare that a magic pole has a power of boiling the water or that he has so hot breath when breathing to the water or blows on it, it starts boiling.