Pickling, salting, drying, smoking are all ways of extending the shelf life of food. There were some ways we learnt for camping in girl guides like submerging in a bag in a cool stream which acts like a refrigerator. I also think in the past people were much better at knowing what was in season, and cooking/eating that while storing what they could for later.
It depends on the food. Generally only a couple more days or a week or two. Depending on the food, putting water in the food saver can keep the food from dehydrating or rotting out.
because reasons
This is because the keep itself is made out of Stone. they were built in medieval times.
Food had to be pretty fresh because there was no real way to keep it good. Salt was used as a preservative and things were smoked, but all in all food was gotten or sent for each day to be served that day. There was a great deal of spoiled food, though.
Medieval chefs like other medieval workers for the gentry were usually paid in keep (paid in food and accommodation and clothing). With only a small amount in wages (money).
To keep invaders, lepers, and whoever else they didn't like out!
In the medieval times people lived in wooden cottages all plotted together in a small village. they would often have well secured pens for their livestock to keep predators and theifs out!
Petroleum Jelly on the cut edges of a pumpkin will slow the oxidation and rotting of the fruit.
in ancient time the people use ice and snow to preserve the food. Then they think about a machine to cool the food . this leads to the invention of refrigerator.
In medieval times, a Keep is a fortified tower found within a castle. It was usually the most fortified interior part of the castle and was used as a last line of defense, where the nobility would hole themselves up in with their guards should the outer castle be taken.
a medieval tower on a motte
tree