Preheat the grill or grill pan to medium-high. Brush the cut sides of the romaine halves lightly with olive oil and season with a small pinch of salt and pepper.
2 romaine hearts, 1 tsp olive oil
Grill the romaine cut-side down for 2–3 minutes until lightly charred and just slightly wilted. Remove and set aside.
In a small bowl or jar, whisk together olive oil, red wine vinegar, lemon juice, Dijon, oregano, garlic, salt, and pepper.
2 tbsp olive oil, 1 tbsp red wine vinegar, 1 tsp lemon juice, ½ tsp Dijon mustard, ½ tsp dried oregano, 1 small garlic clove, 1 pinch salt, 1 pinch pepper
Place grilled romaine halves on a plate. Top with sliced cucumber, cherry tomatoes, red onion, olives, and crumbled feta. Drizzle with vinaigrette and sprinkle with fresh parsley or oregano.
½ cucumber, ½ cup cherry tomatoes, ¼ cup Kalamata olives, ¼ red onion, 2 tbsp feta cheese