Fill a large pot with water, add 1 tablespoon of salt and a splash of oil, and bring the water to a boil. Add the orzo and simmer for 9 to 11 minutes, stirring occasionally, until it's cooked al dente. Drain and pour into a large bowl. Whisk together the lemon juice, 1/2 cup olive oil, 2 teaspoons salt, and 1 teaspoon pepper. Pour over the hot pasta and stir well.
Add the scallions, dill, parsley, cucumber, onion, 2 teaspoons salt, and 1 teaspoon pepper. Toss well. Add the feta and stir carefully. Set aside at room temperature for 1 hour to allow the flavors to blend, or refrigerate overnight. If refrigerated, taste again for seasonings and bring back to room temperature before serving.
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