Wash and dry cucumbers and strawberries. Thinly slice cucumbers, hull and quarter strawberries, thinly slice red onion, and tear herbs.
Whisk together olive oil, lime juice, honey, and Dijon mustard in a small bowl or jar. Season with salt and pepper and adjust to taste.
Combine cucumbers, strawberries, red onion, and herbs in a large bowl. Drizzle dressing and toss gently. Top with feta and toasted nuts if desired and serve immediately or chill 10–15 minutes.
Notes
For less watery cucumbers, salt sliced cucumbers and let them drain in a colander for 10 minutes, then pat dry.
Keep dressing separate if making ahead to maintain crispness.
Substitute peaches or blueberries for strawberries for a tasty variation.