Finely dice the cucumbers. If they are very watery, lightly salt them and let them rest for 10–15 minutes before patting dry with paper towels.
In a large mixing bowl, combine the yogurt, garlic, dill, olive oil, and salt. Stir until smooth and creamy.
Fold in the cucumbers and walnuts until evenly distributed throughout the yogurt mixture.
Cover and refrigerate for at least 30 minutes to allow the flavors to blend together.
Garnish with additional dill, walnuts, and a light drizzle of olive oil before serving.