Bring the apple cider vinegar, water, sugar, salt garlic, and peppercorns to a boil over medium-high heat in a large saucepan. Hold the boil for 60 seconds then carefully add the celery. Return to a boil and turn off the heat.
Move the celery to jars with lids or an air tight container. Pour on as much of the pickling juice as possible. Leave at room temperature until cool.
Once cool, tighten the lid and refrigerate. Consume within one month.
For best flavor, chill at least 24 hours before serving.