Darcy O’Neil revived this drink in his 2010 book Fix the Pumps (the drink originally appeared in R. de Fleury’s 1800 and All That – Drinks Ancient and Modern). O’Neil makes his own acid phosphate, which can be purchased via artofdrink.com.
1 oz. lemon syrup
1 tsp. Angostura bitters
½ tsp. acid phosphate
Chilled soda water
Combine the syrup, bitters and acid phosphate in a highball. Add ice cubes if desired. Top with chilled seltzer.
For the lemon syrup: Combine 2 tsp. of gum arabic and 1/2 tsp. of lemon oil with 2 tsp. of sugar. Set aside. Dissolve 1 cup of sugar in the juice of 8 lemons. Add the gum arabic mixture to the lemon juice mixture and dissolve, heating if necessary.
Adapted from Darcy O’Neil’s Fix the Pumps