Pour 0.3 oz of fino sherry, 0.3 oz of Benedictine, and 0.3 oz of dry vermouth into the mixing glass
Add 1 dash of citrus bitters, 2 dashes of walnut bitters, and 1.5 oz of London dry gin
Fill the glass with ice cubes and carefully mix with a bar spoon
Strain into the cocktail glass
Garnish with lemon zest and walnuts on a skewer