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)

Pour all ingredients into cocktail shaker filled with ice. Shake well and strain into cocktail glass and serve straight up (without ice).

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.