Instructions

1. 1

   Wash, halve and stone the plums, then toss with sugar, cinnamon and lemon juice and let them draw juice.

2. 2

   Heat the oven to 150 degrees. Spread the fruit with the star anise in a large baking dish.

3. 3

   Reduce uncovered in the oven, stirring roughly once an hour, until the mass turns dark and thick.

4. 4

   Remove the star anise, blend the hot butter until smooth and immediately fill it into clean jars.