First: Prepare Orange Foam. Then: shake all but orange foam with ice, strain into a sugar-rimmed coupe or cocktail glass. Top with orange foam.
To make orange foam: blend 200 ml orange juice, 1 oz of agave syrup, 2 dashes of orange bitters, 0.5g of lecithin and 0.5g of xanthan gum. Put this in a whipper, charge, shake & dispense on top of the cocktail.
Railcar #91 was H. M. Flagler's (the founder of the Breakers Hotel) private rail car as he traveled mostly by train.