4-lbs plums (or so)
1 T sugar
1 t salt
ground black pepper, to taste, optional
1 T balsamic vinegar
1 T olive oil
3 T fresh thyme leaves (about 15 sprigs) or 1 T dried thyme

1. Heat oven to 250ºF. Cut plums in half lengthwise and remove pits. Cut each half into half again. Place in a large mixing bowl and sprinkle with sugar, salt, pepper, vinegar, and oil. Toss to coat well.

2. Arrange plums on a parchment-lined baking sheet, cut sides up, about an inch apart.  Sprinkle liberally with (fresh) thyme. Put in oven for 3 hours. Turn off oven, and allow plums to remain inside at least 2 more hours or overnight. Plums will be wrinkled but still quite juicy when done.