Cheese possessed? That could be an omen. I don't remember square sausages in Vulcan rations (sounds like you had to eat 'em cold or have a galley to warm 'em up).
The key to soup heating was to start warming at taxi, with the prospect of a 4-5 hour sortie (not uncommon on 27 MRR) and hope not to go u/s early - and be very careful if you forgot to pierce the can at stage 1 of the process. Not that I pesonally tried it - but had a cupboard ful of assorted soup at home
And don't forget the prospect of a weather scrub invariably caused a mad dash for the feeder - so get the forecast early and eat before planning.
Mister B