Ingredients
1
vanilla bean, halved lengthwise
4
lb ripe plums, cut into 1/2-inch wedges
1/4
cup fresh lemon juice
Special equipment: 5 (1/2-pint) canning jars with lids and screw bands; a food mill fitted with fine disk
Directions
1.
Sterilize jars and lids.
2.
Freeze several small plates to use for testing butter.
3.
Scrape seeds from vanilla bean into a 5- to 6-quart heavy pot. Add pod and stir in remaining ingredients. Slowly bring to a rolling boil over moderate heat (this will take about 15 minutes), stirring frequently. Boil, uncovered, stirring frequently, until plums are tender, about 5 minutes.
4.
Discard pod. Purée plums with liquid in batches in food mill set over a bowl. Transfer purée to pot and simmer over low heat, stirring and scraping bottom of pan frequently, until very thick, about 1 1/2 to 2 hours. (To test for doneness, drop a spoonful of plum butter on a chilled plate, then tilt; the mixture should not be runny. It should be about as thick as jam.)
5.
Drain jars upside down on a clean kitchen towel 1 minute, then invert. Ladle plum butter into jars, leaving 1/4 inch of space at top, then run a thin knife between plum butter and jar to eliminate air bubbles.
6.
Seal, process, and store filled jars, boiling plum butter in jars 10 minutes.
7.
Let plum butter stand in jars at least 1 day for flavors to develop.
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