Slice exactly 6 Persian cucumbers into uniform 1/8-inch coins. Take 2 cups of cooked chicken breast and finely dice the meat into small cubes that match the exact diameter of the cucumber coins. Place both into a large mixing bowl. Uniformity is critical for an even coating of the lipid dressing.
Finely dice 1/2 of a red onion. Immediately transfer the diced onion into a small ramekin and submerge it completely in cold water. Let it soak for exactly 5 minutes. This extracts the harsh, pungent sulfur compounds. Drain the water thoroughly before use.
In a separate non-reactive bowl, combine the wet ingredients: 1/2 cup Greek yogurt, 2 to 3 tablespoons mayonnaise, 1 tablespoon Dijon mustard, and 1/2 tablespoon olive oil. Use a microplane to grate the zest of 1 whole lemon directly over the bowl. Squeeze the juice of 1.5 to 2 lemons into the mixture. Add a heavy pinch of kosher salt and black pepper. Whisk vigorously until the mixture transitions into a smooth, opaque, heavy cream.
In a separate non-reactive bowl, combine the wet ingredients: 1/2 cup Greek yogurt, 2 to 3 tablespoons mayonnaise, 1 tablespoon Dijon mustard, and 1/2 tablespoon olive oil. Use a microplane to grate the zest of 1 whole lemon directly over the bowl. Squeeze the juice of 1.5 to 2 lemons into the mixture. Add a heavy pinch of kosher salt and black pepper. Whisk vigorously until the mixture transitions into a smooth, opaque, heavy cream.
Pour the fully whisked dressing directly over the dry ingredients in the large bowl. Using two large spoons, toss continuously. Ensure the white emulsion fills the crevices of the diced chicken and completely coats the hydrophobic skin of every cucumber slice.
Serve immediately for maximum crunch, or divide evenly into 3 glass meal-prep containers for metabolic-friendly lunches throughout the week.