Pour Water Over Mushrooms, Let Stand 30 Minutes. Cut Mushrooms Into 1/4 Inch Strips. Saute Mushrooms, Onion, And Garlic In Oil. Until Onion Is Tender. Add 1/2 & 1/2 And Salt. Heat To Boiling, Reduce Heat, Simmer Uncovered 5 Minutes. Cook Fettucine As Directed. Pour Sauce Over Hot Fettucine Until It Is Well Coated. Top With Ground Pepper.