Wikipedia
Zazarac
An American cocktail which may be related to the Sazerac, although it might have originated completely independent of the more famous drink. It is made with gomme syrup which has a much higher concentration of sugar than simple syrup, which some modern variations of the recipes replace it with; the addition of several types of bitters makes this a spicy drink.
The drink was included in the famous mixologist, Harry Craddock's book of drinks, The Savoy Cocktail Book, and was highlighted in the Forbes Magazine's article about the 2007 reprint of the notable bar recipe book. It's also listed in such other notable mixology books such as Harry MacElhone's Harry's ABC of Mixing Cocktails, published in 1928.