Prep the vegetables: Slice the cucumber, halve the tomatoes, thinly slice the red onion and bell pepper, and chop the parsley. Place everything in a large mixing bowl with the olives.
Make the lemon dressing: In a small jar or bowl, whisk together the olive oil, lemon juice, lemon zest, garlic, oregano, Dijon, salt, and pepper until emulsified. Taste and adjust seasoning.
Add the feta: Gently fold in the feta cubes or crumbles.
If you prefer a cleaner look, you can place larger slabs of feta on top and crumble just before serving.
Dress and toss: Pour about two-thirds of the dressing over the salad. Toss gently to coat without smashing the feta or tomatoes. Add more dressing as needed.
Rest briefly: Let the salad sit for 5–10 minutes so the flavors mingle.
This short rest makes a big difference in taste.
Finish and serve: Sprinkle with parsley, add a pinch more salt or pepper if needed, and serve chilled or at room temperature.