Traditional:
2 parts Amaretto liqueur
1 part sour (half a lemon)
Shaken with ice, strained into an old fashioned glass that has had its rim optionally “frosted” with granulated sugar, and garnished with a maraschino cherry
Modern:
3 parts Amaretto
1 part sour mix instead of the lemon juice;
do not frost the rim of the glass with sugar.