Begin by washing the cucumbers and radishes under cold water. Slice the cucumbers and radishes to about 1/8-inch thickness.

In a small bowl, combine olive oil and lemon juice. Add salt and pepper to taste, and whisk until emulsified.

Pour the dressing over the sliced cucumbers and radishes. Add green onions and dill, then gently fold the mixture together.

Taste the salad and adjust the seasoning if needed. Transfer to a serving dish and garnish with extra dill or green onion if desired.