Wash and finely chop the romaine lettuce. Dice the cucumber, cherry tomatoes, and red onion. Dice the kalamata olives. Add everything to a large salad bowl.
Make the dressing: In a small bowl or jar, whisk together olive oil, red wine vinegar, oregano, grated garlic, dijon mustard, honey, lemon juice, salt, and pepper until well combined and emulsified.
Taste the dressing and adjust seasoning as needed — add more vinegar for tang, honey for sweetness, or salt and pepper to taste.
Crumble the feta cheese over the salad.
Pour the dressing over the salad just before serving and toss well to coat all the ingredients.
Serve immediately and enjoy! This salad pairs beautifully with Greek air fryer chicken thighs.