1 1/2 fluid ounces cognac
1/2 fluid ounce yellow Chartreuse
1 tablespoon fresh lemon juice
1/2 teaspoon white sugar
2 dashes aromatic bitters (such as Angostura®), or to taste
Add ice to a cocktail shaker. Pour in cognac, Chartreuse, and lemon juice. Spoon in sugar and shake in a dash or two of bitters. Cover and shake well. Strain into a chilled martini glass.