1.Add The Vinegar, 1 Tbs Of The Oil, Salt, And Pepper In A Small Bowl. 2.Add The Asparagus In Boiling Water For Just A Few Minutes Until They Are Crisp. 3.Drain And Pour Ice Water Over Them Immediately. 4.Heat The Remaining 1 Tbs Oil In A Pan On Medium High Heat. 5.Add Mushrooms And Saute Until They Are Soft. 6.Add Green Onions, Saute 1 Minute. 7.Add The Asparagus, And Cook Another 3 Mins. 8.Remove From The Heat Then Slowly Add In The Vinegar Mixture. 9.Toss The Toasted Hazelnuts Over The Top.