Small Batch Plum Sauce

It isn't quite plum season, but I wanted plum sauce and I'd run out of last year's canned batch. What to do? Improvise. This recipe will make a scant pint.

You Will Need:

2-3 large fresh plums (red, black, whatever)
12 whole prunes, chopped, pits removed (duh)
1/2 large onion, finely chopped
1 tablespoon chopped, fresh ginger
1 garlic clove, finely minced
1/4 teaspoon mustard seeds
1 cup dark brown sugar
1/4 teaspoon salt
1/4 cup vinegar (cider, white wine, whatever you like)

Toss it all in a pot and cook the daylights out of it over moderately high heat until thick. You'll need to keep stirring so it won't stick, but the whole thing takes about twenty minutes, so it isn't a huge chunk of your time.