Greek Orzo Salad

1 cup uncooked orzo pasta
6 teaspoons olive oil, divided
1 medium red onion, finely chopped
1/2 cup minced fresh parsley
1/3 cup red wine vinegar
1-1/2 teaspoons dried oregano
1 teaspoon salt
1/2 teaspoon sugar
1/8 teaspoon pepper
2 large tomatoes, seeded and chopped
1 medium cucumber, peeled, seeded and chopped
12 pitted Kalamata olives, halved
1/2 cup crumbled feta cheese

Cook orzo according to package directions; drain. In a large serving bowl, toss orzo with 2 teaspoons oil.

In another bowl, combine the onion, parsley, vinegar, oregano, salt, sugar, pepper and remaining oil; pour over orzo and toss to coat. Cover and refrigerate for 2-24 hours. Just before serving, gently stir in tomatoes, cucumber, olives and cheese.