In a medium saucepan, combine butter and water. Heat to boiling. Stir in flour and salt with a wooden spoon. Stir until a smooth mixture surrounds the spoon. Remove from heat. Beat in eggs, one at a time until mixture is thick and smooth. Drop by heaping teaspoonsful, 2" apart, onto a lightly greased cookie sheet. Bake at 400º for 25 to 30 minutes or until light brown and puffy. Cool on a wire rack.
Rinse shrimp with cold water and drain, or drain crabmeat. Combine shrimp (or crabmeat) with celery, onion, and hard cooked eggs and mix well. Set aside. Blend mayonnaise, lemon juice and salt. Fold into shrimp or crab mixture. Chill 1/2 hour.