Mix cucumbers, red onion, and sea salt together in a bowl. Let sit for 15 minutes.
Drain off the accumulated liquid, mix and let sit for 15 minutes more. Drain off the liquid again.
In a large bowl, stir mayonnaise, lemon juice, chopped herbs, green onion, garlic, and black pepper together in a bowl until smooth.
Add the drained cucumbers, white sesame seeds and stir well to coat the cucumbers with the dressing.
Plate the salad in layers as shown on the picture. Garnish with black sesame seeds and whole dill and parsley or cilantro twigs.
Serve right away or cover the bowl with plastic wrap and refrigerate for several hours.