Combine plums, rosemary, honey and Chinese five spice in a small sauce pot over medium-high heat.
Bring the mixture to a boil then reduce to a low simmer, stirring often until plums start to break down.
Add the lemon juice and continue cooking and stirring until mixture is thickened and reduced to a jam-like consistency.
Remove from heat and let cool. Jam will thicken even more as it cools.
Serve with goat cheese (I used a honey lavender goat cheese) and crackers.
Notes
Add honey according to taste preference. I used 1 tablespoon for a relatively tarter jam. If you like things sweet, add at least 2 tablespoons to start and adjust to taste from there.