It takes a bit of skill to make a truly good Amaretto Sour. First of all, use fresh lemon juice whenever possible, and use a chilled sour glass as well. Rub the rim of your glass with a lemon slice, and dip it in bar sugar until the rim is well frosted. Shake amaretto and lemon juice in a shaker, then strain into sour glass. Garnish with an orange slice or maraschino cherry, and enjoy!