Bring large pot of water to a boil. Add salt, then bulgur (cook as you would pasta). Boil for 12 to 15 minutes, or until bulgur is tender but not mushy. Drain very well and refrigerate until cool. Meanwhile place feta, tomato, green onion, cucumber and mint into medium sized serving bowl. Gently toss. In small bowl, whisk oil with vinegar, salt and pepper. Add cooled bulgur to feta mixture and toss gently. Then toss with olive oil mixture. Taste and add more salt if necessary. Refrigerate until ready to serve. Salad taste best if served within a couple of hours of being made.