Prep the cucumbers: Wash and thinly slice the cucumbers into rounds. Aim for about 1/8-inch thickness. If using standard slicing cucumbers, peel them and scoop out seeds to avoid extra wateriness.
Salt to draw out moisture: Place the cucumber slices in a colander over the sink.
Toss with 1 teaspoon of salt and let them sit for 15–20 minutes. This helps keep the salad from getting watery.
Rinse and pat dry: Rinse the salted cucumbers briefly to remove excess salt. Lay them on a clean kitchen towel or paper towels and pat dry thoroughly.
Slice the onion: Cut the red onion into very thin slices.
If you prefer a milder flavor, soak the slices in cold water for 5–10 minutes, then drain and pat dry.
Make the dressing: In a mixing bowl, whisk together yogurt, mayonnaise, vinegar, sugar or honey (if using), Dijon (if using), and garlic. Season with a pinch of salt and several grinds of black pepper. Taste and adjust for tang, sweetness, and salt.
Add herbs: Stir in the chopped fresh dill.
You can add more to taste, but start with 2 tablespoons.
Combine: Add the cucumbers and onions to the bowl. Gently toss until everything is evenly coated with the dressing.
Chill: Cover and refrigerate for at least 20–30 minutes to let the flavors meld. If chilling longer than an hour, give it a quick stir before serving and taste for seasoning.
Serve: Finish with a crack of black pepper and a sprinkle of fresh dill on top.
Serve cold.