1.Heat 1 Tablespoon Butter In A Large Skillet Over Medium-High Heat. Stir In The Mushrooms, And Cook Until Golden. With A Slotted Spoon, Remove Mushrooms, And Set Aside. 2.Melt Remaining 1 Tablespoon Butter In The Skillet, And Stir In Shrimp And Scallops; Cook, Turning, Until The Shrimp Are Pink, About 3 Minutes. With A Slotted Spoon, Remove Shrimp And Scallops, And Set Aside. 3.In A Medium Bowl, Mix Together The Flour, Black Pepper, And Clam Juice. 4.Pour Clam Juice Mixture Into The Skillet, And Bring To A Boil. Reduce Heat To Medium-Low, And Simmer Until Mixture Thickens. Reduce Heat To Low, And Stir In Sour Cream. Return Mushrooms, Shrimp, And Scallops To The Skillet; Mix In Sherry, And Cook To Heat Through. Sprinkle With Parsley.