About 10 minutes before eggs are done, prepare sauce. In small saucepan, combine butter, water and 1/8 teaspoon salt. Bring to a boil over medium heat. Remove saucepan from heat. In small cup or bowl, beat egg yolks. Slowly blend small amount of hot liquid into egg yolks. Return yolk mixture to saucepan; cook and stir over low heat just until thickened. Remove from heat. Stir in lemon juice. To keep warm, set saucepan in larger pan of hot water.