Source: New Joys of Jell-O

1 small box lime Jell-O
1 cup boiling water
2 teaspoons grated lime rind
1/2 cup lime juice
1 egg yolk, well beaten
1 1/3 cups sweetened condensed milk
1 teaspoon aromatic bitters*
1 egg white
Drop green food coloring (optional)
1 baked 9-inch pie shell, cooled

Dissolve gelatin in boiling water. Add lime rind and juice. Pour slowly into beaten egg yolk, stirring constantly. Add condensed milk and bitters. Chill until slightly thickened.

Beat egg white until stiff peaks will form. Fold into gelatin mixture. Add food coloring. Pour into pie shell. Chill until firm-about 3 hours. Garnish with lime slices or prepared whipped topping, if desired.