Soak the bulgur in very hot water (enough to cover the bulgur by 1") with 1 tablespoon of sea salt for 30 minutes. Drain and rinse with cold water until completely cooled and drained. Fluff and set aside. Combine all other ingredients (except feta) and mix well. Marinate these ingredients for up to one hour in the refrigerator. In a large bowl, combine completely drained and cooled bulgur with the marinated ingredients, tossing well to combine. Sprinkle with feta if using. Adjust seasoning and serve.