Chill a cocktail glass, then rinse it with absinthe - add a small amount, swirl to coat all interior surfaces, and discard the excess.
Combine gin, Cointreau, Lillet Blanc, and fresh lemon juice in a cocktail shaker.
Fill the shaker with ice and shake vigorously for 12–15 seconds until well chilled and properly diluted.
Double-strain through a fine mesh strainer into the prepared absinthe-rinsed cocktail glass.
Garnish with a lemon twist, expressing the oils over the surface before placing on the rim.
Harry Craddock's 1930 Savoy Cocktail Book warns to 'drink four of these in swift succession - it will unrevive the corpse again.' The absinthe rinse is essential and non-negotiable: it provides aromatic lift without overwhelming the delicate balance of the equal-parts base.
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