A sword???
They brought back knowledge that had been lost before the crusades
Diabeetus and ADHD.
water can not preserve food it attracts mold
Because they were so good
Freezers have a motor. This motor is used to bring cold air to low temperatures. Then it can freeze food or whatever when placed in it. A freezer is great because it can save your food and will preserve it.
cinnamon!
They brought trade.
On meat, salt can preserve food.
They stuffed the food with salt which would let it dry out and that's how they would preserve it.
well once you have cooked the food it is ready to it so there is no need to preserve it
Water doesn't necessarily preserve food. However, the canning process can preserve food. The boiling process can prevent any transfer of bacteria, fungus or microbes.