Yes, it should be safe to heat it over a fire in the opened can.
Of course they did, what else could they cook over?
yes
put meat on sticks then over fire
Over an open fire, on a grill or weave of sticks, you can cook meat or vegetables or marshmallows on sticks. You can also use a dutch oven with a lid to cook baked beans or biscuits over hot fire coals.
Ancient Egyptians cooked mainly over open fire.
If they were rich, they had servants to cook in the kitchen for them and they had this massive fire place where you could stick meat or hang a bucket (they used to boil water) over the fire on a great big metal rod called a spit-fire but if they were poor they would have to build a fire on their own outside and cook the meat or boil the water over it on a smaller spit-fire.
put meat on sticks then over fire
put meat on sticks then over fire
She use to put it in a clay bowl made by her or another woman and cook it over a fire
a toaster, just kidding you cook it over a fire,
marshmallows, sausages, eggs, toast,
They cook it over a nice hot fire.