The skins from stone fruit will contribute color and flavor to the jam. But for a smoother mixture, you can start by peeling peaches: Carve an X in the bottom of each and plunge them into boiling water for 30 seconds, then transfer them to an ice-water bath to stop the cooking; the skins will slip off. For plums, just lift the skins out of the cooked jam with a fork.
- Total Time:
- Yield: Makes about 5 cups
Photography: Christopher Testani
Source: Martha Stewart Living, September 2015
- 1 1/2 pounds peaches, peeled (optional), pitted, and cut into 1-inch chunks if large
- 1 1/2 pounds plums, pitted
- 1 1/2 pounds sugar (3 1/3 cups)
- Coarse salt
- 2 tablespoons fresh lemon juice
Stir together fruit, sugar, and 1/4 teaspoon salt in a large heavy-bottomed pot. Bring to a boil, stirring until sugar is dissolved and mashing fruit with a potato masher. Add lemon juice; continue to boil, stirring frequently, until bubbles slow, chunks of fruit show at top, and mixture clings to a spoon but falls off in clumps, 10 to 12 minutes. Skim foam from top.
Ladle jam into clean containers, leaving 3/4 inch of headroom. Let cool completely. Cover, label, and refrigerate up to 1 month, or freeze up to 1 year.