Key Lime Pie
["1 (3 oz.) pkg. lime Jell-O", "1 c. boiling water", "1 egg yolk", "1 tsp. aromatic bitters", "few drops green food coloring (optional)", "1 baked 9-inch pie shell", "1 or 2 tsp. lime rind, grated", "1/2 c. lime juice", "1 1/2 c. (15 oz.) condensed milk", "1 egg white"]
["Dissolve Jell-O in boiling water.", "Add lime rind and juice. Beat egg yolk slightly; slowly add gelatin, stirring constantly. Add milk and bitters, stirring until blended.", "Chill until slightly thickened.", "Beat egg white until stiff peaks form.", "Fold into Jell-O mixture.", "Add food coloring.", "Pour into pie shell. Chill until firm.", "Garnish with whipped cream or Cool Whip and lime slices, if desired."]
["lime Jell-O", "boiling water", "egg yolk", "aromatic bitters", "coloring", "shell", "lime rind", "lime juice", "condensed milk", "egg"]