01 -
In a large saucepan, combine mulberries, sugar, lemon juice, cinnamon (if using), and water.
02 -
Cook over medium heat, stirring frequently, until the sugar dissolves and the mixture starts to boil.
03 -
Reduce heat and simmer gently for 20-25 minutes, stirring occasionally, until the jam thickens and reaches a gel-like consistency.
04 -
To test, place a small spoonful on a chilled plate; if it wrinkles when pushed with your finger, the jam is ready.
05 -
Remove from heat and let cool slightly before transferring to sterilized jars. Seal jars and refrigerate after opening.