Prepare Cucumbers and Onions: Thinly slice the cucumber using a mandolin or a knife.

Thinly slice the sweet onion using a mandolin or a knife.

Salt and Drain: Add the cucumber and sweet onion slices to a colander.

Sprinkle with a little salt to draw out the water.

Let it sit for about an hour, tossing occasionally.

Pat Dry: After an hour, pat the cucumber and onion slices dry with paper towels to remove excess water.

Make the Dressing: In a bowl, mix together the sour cream (or Greek yogurt), rice vinegar, fresh dill, chives, and a little more salt.

Combine and Toss: Add the drained cucumber and onion slices to the dressing.

Toss until everything is well coated.

Serve: Pour the salad into a serving bowl.

Garnish with additional fresh dill and a sprinkle of black pepper.