Either in a microwave or on the stove, bring water, vinegar, and pickling salt to a boil, stirring until the salt has dissolved. Set aside.
Add the coriander seeds, mustard seeds, peppercorns, bay leaves, garlic, and beets to your canning jar/jars. Use a mandolin to slice your cucumbers to your desired thickness, then place them in the jars.
Using a liquid measuring cup, pour the pickle brine into the jars. Let the jars come to room temperature, then put the lids on. I like to put a piece of tape on top of the lid with the date I made them.
The beets will start to release their pink color right away, but after a day or two, they'll be much more pink!
Store the pickles in the fridge. They should last up to 1-2 months. Enjoy!
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Notes
Persian, snacking, and Kirby cucumbers have thinner skins and less water and seeds than traditional slicing cucumbers, so they're ideal for pickles.
To prevent contamination, be sure to use a clean utensil when getting pickles out of the jar, not your fingers.
If your pickles aren't covered with the pickle brine, add white vinegar until they are.