1) Discard seasoning packet from noodles or save for another use. In a skillet, saute noodles in butter until golden.
2) In large bowl, combine noodles, broccoli, lettuce and onions.
3) In a jar with a tight-fitting lid combine the remaining ingredients (except walnuts) for the dressing. Shake well.
4) Just before serving toss with dressing and walnuts.