- Bring the vinegar, water, sugar, salt, and mustard to a boil in a medium saucepan, stirring until sugar is dissolved. Simmer for a few minutes; take off the heat and allow to cool a bit.
- Add peppercorns and beets to a clean glass jar with a tight fitting lid. (This particular recipe fits nicely into a 1 liter sized jar.) Pour the brine in, covering all the beets.
- Cover and set aside for several hours (or up to 24), then transfer to the refrigerator.
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