1. Pour water to a depth of 1 1/2 inches into bottom of double boiler over medium-high heat; bring to a boil. Reduce heat to a gentle boil. Place egg whites and sugar in top of double boiler. Beat at high speed with an electric mixer 5 to 7 minutes or until stiff peaks form. Gradually pour in corn syrup and lemon juice, beating 7 minutes or until spreading consistency.