Step 5. Put the vinegar, sugar, water, mustard, and salt in a pan, and bring to a boil.
Step 6. Let the mixture cool for a few minutes.
Step 7. Put the beet slices and peppercorns in a clean 1-quart sized glass jar (or a pair of ½-quart ones).
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Step 8. Pour in the brine to cover the beets completely.
Step 9. Put the lid on the jar, ensuring it’s screwed on tight.
Step 10. Leave it at room temperature for 24 hours and then transfer into the fridge.





