Sidecar in a Martini Glass garnished with lemon wedge
2 oz Cognac
3/4 oz Lemon juice
3/4 oz Triple sec (or Cointreau or Grand Marnier)
Many places serve a variant where the cocktail glass has had its outside rim rubbed with lemon juice and dipped in sugar. (Similar to a Lemon Drop.) Let your bartender know whether you want the classic or variant.