Rinse off any dirt from cucumbers and scrape off the flower end of the cucumbers to ensure there are no flowering parts (enzymes & molds can make pickles mushy). If using slicing cukes, slice into ¾″ thick pieces. Leave whole if using pickling (Kirby) variety.
Slice beets into matchstick sizes (julienne).
To a clean half-gallon or larger glass jar or ceramic crock, add mustard seeds, celery seeds, and beet slices.
Add a fruit tree leaf to jar.
Add the cucumbers. Pack them as tightly as you can.
Mix Brine: Add sea salt into filtered water. Stir until salt dissolves.
Add liquid whey or pickle brine from a previous batch to container.
Place a lid or plate that is slightly smaller than the diameter of the container on top of cukes. Add a weight like a jar or wine bottle filled with water. OR, If using a small batch fermentation kit, add the weight(s) to the jar.
Slowly pour brine into jar until there’s enough to cover the contents.
Cover container with a tea towel or clean dishcloth to keep dust and flies out, and secure with twist ties or a rubber band.