Slice the cucumbers into thin rounds or half-moons.

Cut the tomatoes into wedges or slices.

Thinly slice the onion and add it to the bowl with the vegetables.

Add the sour cream, salt, and a pinch of black pepper.

Gently toss everything until evenly coated.

Sprinkle with finely chopped green onion on top or mix it into the salad.

Taste and adjust salt if needed. Serve immediately.