Old Tom Gin
There is no hard and fast answer to the question, "What is Old Tom?" Old Tom must include Juniper like any other Gin, but outside of Juniper there are no real clear-cut guidelines laid out by the TTB. You can age it or not, add sweetener or not, or make it from grain or neutral spirit.
In ours we've used a recipe fairly close to our signature gin but with the additions of Liquorice, local honey, and time in a barrel. This batch of versatile Old Tom Gin goes great with soda water and a lemon wedge just as well as it stands up in a Martinez cocktail.