How to make strawberry jam without preservatives

The strawberry jam. To make strawberry jam you have to prepare fresh strawberries and clean jars. It depends on you on how many kilos you want to make but if you want to make 10 small jars so you can buy 6 kilos of strawberries. Wash the strawberries very well then put to cauldron with a small fire but if you want to do it fast you can make your fire bigger then when it’s boiling mix it very well and be sure to mix it every 10 to 20 minutes to avoid burn jam. If you want a little bit sweet you can add sugar or even 1 spoon of xylitol .For few hours you will noticed that it is already sticky and ready to serve and it’s ready to put to jars if you want to preserve it for few years but be sure that you put the jam when it’s newly cook or when it’s very hot and put it in the sterilized jar and cover it quickly and put it upside down . The next day check the covers if it pump up so it means it is not good to preserve or you can eat it not more than 1 month. When jars of strawberry jam is good so you can put it in cold room or to fridge and you can preserve it even up to 5 years.