Bring 5 quarts of water to a rolling boil. Once boiling, add ¼ cup salt. Add the orzo pasta to the water and stir. Cook for 8-9 minutes or until al dente, stirring occasionally to prevent the pasta from sticking.
While the orzo is cooking, zest and juice the lemons into a large mixing bowl. Whisk in the olive oil.
When the orzo is done cooking, drain the pasta water (do not rinse). Toss the hot orzo with the lemon citrus vinaigrette. Set aside to cool while you chop the remaining ingredients.
Fold in the red peppers, grape tomatoes, green onions, parsley, and basil.
Refrigerate for at least two hours. If desired, add crumbled feta cheese before serving. Toss well and serve cold.