01 - 
                Zest the lemons and squeeze enough juice to yield half a cup.
              
              
              
                02 - 
                In a mixing bowl, whip the heavy cream until soft peaks form.
              
              
              
                03 - 
                In another bowl, combine sugar and egg whites; whip until stiff peaks form.
              
              
              
                04 - 
                Gently fold lemon juice and zest into whipped cream.
              
              
              
                05 - 
                Carefully incorporate the egg whites into the lemon mixture.
              
              
              
                06 - 
                Chill in the refrigerator for at least four hours before serving.