1/2 oz Green Chartreuse
1/2 oz Clement Creole Shrubb (or other orange liqueur)
1/2 oz Lemon Juice
1 1/2 oz Whole Milk (Heavy Cream preferable)
1 Egg White
Shake once without ice and once with ice. Strain into a Highball glass with 2 oz soda water. Garnish with an orange twist.
(*) A brandy such as Lustau would have worked well here too.