Dice the cucumbers finely or grate them. Scrape them into a strainer or colander.
Sprinkle the cucumbers with 1 teaspoon salt, gently mix, and let them drain for 30 minutes.
Cover the minced onion in a small bowl and cover with cold water. Let it soak for 30 minutes.
Squeeze excess juices from the cucumbers with your hands and put them in a large bowl. Drain the onion and mix with the cucumbers.
Add the sour cream and chives to the cucumber/onion mix. Stir, and add the lemon juice. Season with black pepper.
Taste and adjust salt, lemon juice, and pepper as needed. Refrigerate for at least 1 hour before serving.