An environmental issue and health reminder:
A tuna sandwich with onion has a slightly longer 'under-seat-shelf-life' than without.
Even so, for the air breathers and tree huggers out there - do not go much past 2 weeks without checking on the sandwiches. Remember, it gets warm under there and it's dark. Great for cheese making - but , to paraphrase Colonel Hal Moore - "gets pretty sporty for tuna sandwiches!"
Stig