Place all ingredients for the brine into a medium-sized non-reactive saucepan such as stainless steel, enameled, or glass—not aluminum or copper. Bring to a boil over high heat, stirring constantly until the sugar has completely dissolved. Once the brine reaches a full rolling boil, remove the pan from the heat, then set it aside to reach room temperature.

While you are waiting for the brine to cool, prepare the vegetables. First, trim the ends from the cucumbers and discard. Slice the unpeeled cucumbers about ¼" (or slightly thinner) then add them to a large colander. Next, remove the ends from the onion, peel and cut it into quarters. Shave each quarter into paper-thin slices and add them to the colander with the cucumber slices.

Sprinkle 2 Tbsp of kosher salt evenly over the cucumbers and onions then toss until the salt has completely coated the vegetables. Place the colander in the sink to drain any water the salt may draw out. Allow the salt to remain on the vegetables for 30–45 minutes.

Rinse the cucumbers and onions under cold water to remove all excess salt then drain completely. Place the cucumber and onion mixture into a large mixing bowl, pour the room temperature brine over it and remove the bay leaves—if you’d like, you can strain all of the spices from the brine before adding it to the cucumbers.

Add the chopped dill and stir to distribute everything evenly. Cover and refrigerate for at least 4 hours but they’re even better if they sit overnight!