1½ rye whisky½ oz cognac1 tsp demerara gum syrup (1:1)4 dashes Peychaud's bitters1 dash Angostura bittersAbsinthe
instructions :

Rinse an Old-fashioned glass with absinthe and dump.

Stir the remaining ingredients over ice, then strain into the glass.

Express a lemon twist over the drink and discard.

source :
Cocktail Codex