Wash the cucumbers well under cold water and slice them thinly using a mandoline or sharp knife.

Peel and slice the white onion thinly, then add it to the bowl with cucumbers.

Sprinkle the salt over the cucumber and onion mixture, and toss to coat evenly.

Let the mixture sit at room temperature for about 2 hours, allowing the salt to draw out moisture.

After 2 hours, pour the mixture into a colander to drain and rinse under cold water to remove excess salt.

Return the drained cucumbers and onion to the bowl and add the heavy cream or sour cream, followed by the vinegar and chopped dill.

Gently stir to combine, ensuring each slice is coated in the dressing.

Cover and refrigerate for at least 30 minutes before serving to enhance flavors.