Remove tips from asparagus, peel and cut stems into 1/4-inch thick slices; set both aside. Stir Knorr® Homestyle Stock - Chicken into hot water; set aside and keep warm.
Heat oil in heavy-duty saucepan and cook onion, stirring occasionally, until tender and lightly colored, about 5 minutes. Stir in rice and cook, stirring occasionally, 1 minute. Stir in wine and cook 1 minute.
Pour in just enough Stock to cover rice. Bring to a boil over high heat, stirring frequently, then reduce heat to medium-low and cook, stirring frequently and gradually stirring in Stock, until liquid is absorbed, about 25 minutes. If necessary, stir in additional hot water, 1/2 cup at a time, until rice is tender.
Stir in asparagus during last 5 minutes of cooking. Stir in Parmesan, margarine and chervil. Garnish, if desired, with additional fresh chervil or parsley.