Preparation

• Place cold water in a small bowl and sprinkle gelatin over the surface. Allow to stand 5 minutes.
  In a medium bowl, stir together boiling water, 3/4 cup sugar and soaked gelatin. Stir until gelatin and sugar are dissolved.
  Stir in orange zest, orange juice, lemon juice and egg yolk. Set aside. In a large bowl, whip cream with 3 tablespoons sugar and salt until stiff peaks form.
  In a separate bowl, whip egg white until stiff. Fold into whipped cream. Stir in juice mixture a little at a time.
  Pour in an ice cream maker and process according to manufacturer's instructions.