Storing green plums

 You could try this Georgian Sour PLum sauce, which is nice with roast chicken, especially in a sandwich:

For ~2 lbs unripe (sour) plums: simmer with water to cover until soft, about 10 mins (time varies w/size of plums).

Drain, pit and put through strainer or food mill, and return puree to saucepan.

Mix in 1 tsp chopped garlic, 1/4 cup each chopped fresh cilantro and dill, 1/8 tsp hot paprika and ~2 Tbsp lemon juice (more or less to taste, depends on how tart plums are).

Salt to taste, bring to boil and simmer 2 minutes; cool and store in bottles in fridge.