Thinly slice cucumbers, halve cherry tomatoes, and thinly slice red onion. Place all vegetables in a large mixing bowl.
Whisk together olive oil, lemon juice, lemon zest (if using), honey, Dijon mustard, salt, and pepper in a small bowl or jar until combined.
Pour three-quarters of the dressing over the vegetables and toss gently to coat. Add parsley and dill and toss again.
Sprinkle crumbled feta over the salad and fold gently to combine. Let rest 5–10 minutes if desired to meld flavors, then serve with remaining dressing on the side.
Notes
If cucumbers are watery, salt and drain briefly before assembling to reduce excess liquid.
For a vegan version, replace feta with a dairy-free alternative or toasted nuts.
Store refrigerated in an airtight container for up to 2 days; texture will soften over time.