Various bits of legislation cover food handling and I am not aware of any airlines that train their pilots to the required standard. Commercial operators ensure that adequate training is provided to cabin crew with regard to the handling of food though.
Skills are enhanced by adequate training and provision of tools to do the job. It is debatable whether giving pilots a list of circuit breakers to pull (slight over simplification) and a box of food without any instructions could be classed as adequate training.
H&S legislation is a cornerstone of safe operations in just about every area of working life these days and I have no doubt that businesses of many kinds have tried to duck their obligations on the basis that their area is 'Special' or 'It's never been a problem until now' (or maybe even 'We see no need to mollycoddle our staff - They're well paid and can look after them selves).