FLIP:
My employers are the same as yours regarding no
inverters, cookers etc.
I just prep a load of salad and cooked chicken, steak etc on sunday to last for the week not a problem and once a week I’ll eat in the pub when out for a pint. Steak nights at Spoons on a tuesday is a favourite.
Exactly what I do when away from home and 'spoons are surprisingly good at steaks too.