Get a big mixing dish with cold water. Thinly slice the romaine lettuce and crisp in the cold water for 5 minutes while you make the dressing and other ingredients.
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Whisk lemon juice, oregano, and a heavy pinch of kosher salt in a medium basin. Pour with extra virgin olive oil while stirring. Whisk to emulsify. Save for now.
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Remove the salad from the cold water and dry well. Using paper towels or a salad spinner helps. Chopped herbs and feta go in a big serving basin. Gently throw everything.
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Whisk the dressing again and pour it over the salad before serving. Mix or massage the salad to coat it with dressing. Serve now.
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