A sword???
They brought back knowledge that had been lost before the crusades
Diabeetus and ADHD.
During the Crusades, knights brought back various substances from the Middle East, with one of the most notable being spices, such as pepper, cinnamon, and cloves. These spices were highly valued in Europe for their ability to enhance flavor and preserve food. Additionally, they also returned with silks, gemstones, and knowledge of advanced medicine and science, which significantly influenced European culture and trade.
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