this provides a third trigger temperature t3 of 55 u00b0 c in the simmer cycle second trigger temperature t2 will be reached at various time points t2 or t2 39 notwithstanding as soon as second trigger temperature t2 is reached the further temperature increases u03b4ty in time intervals to are measured the further temperature increase u03b4ty in time interval to is compared with a preset minimum temperature increase u03b4tm if the minimum temperature increase u03b4tm is not achieved in time interval to the heating element will remain continuously switched to its full heat output or to a defined heat output throughout the subsequent time interval to if the measured further temperature increase u03b4ty exceeds the preset minimum temperature increase u03b4tm the heat output will be reduced according to a second program shown in fig5 in this instance both the measured further temperature increase u03b4ty as well as the temperature differential ta between the preset cooking temperature tg and the actual measured temperature ti will be taken into account if temperature differential ta is large and the measured further temperature increase u03b4ty is small the heating element will remain continuously switched to its full heat output or to a defined heat output for a time interval s2 as shown in fig5 throughout subsequent time interval to if temperature differential ta is small and the measured further temperature increase u03b4ty is large time interval s2 will be practically zero or only a small fraction of time interval to at an average temperature differential ta of b.