3 dr Herbal liqueur, Elixir Vegetal de la Grande Chartreuse (or sub green)
3⁄4 oz Lemon juice
Shake with ice and strain into a martini glass.
Substitute Ransom Old Tom Gin if there's not an oaked genever in your market, but don't use any bitters other than the Bitter Truth--it's far more floral and less vegetal than other celery bitters.
The Bitter Truth
Bitters, Oude genever, Elderflower liqueur, Herbal liqueur, Lemon juice