I bought some beautiful plums, however they were very sour, so that is why I decided to cook some jam.
800 g plum
350 g sugar
1 cinnamon stick
Slice plum and bring it to boil, cook for 15 mintues on low heat. Add sugar and cinnamon stick. Cook for another 45 minutes while stirring it often. Before putting it into a jar puree with a help of a mixer and cook for another 10 mintues.