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In large bowl, beat egg whites and salt with electric mixer on high speed until soft peaks form; set aside. In 1-quart saucepan, heat 1/3 cup water and 3/4 cup sugar to boiling over medium-high heat, stirring frequently, until sugar is dissolved. Cook over medium heat to 245°F on candy thermometer or until small amount of mixture dropped into cup of very cold water forms a firm ball.