One of the simplest and best mixed drinks ever devised, hence its lasting popularity.
To serve as a Highball use a smaller 10oz (295ml) Highball glass...
The quality of the tonic is crucial ! And as said before, adding some lemon to the gin before adding the tonic can be a plus.
Simple, delicious, timeless cocktail.
The best twist I’ve ever done on a gin & tonic is the addition of grapefruit zest. Just release the oils and discard, don’t leave it in the glass. Makes a huge difference. As long as you have a good tonic like Fentimans or Fever tree (prefer the Mediterranean for the Indian) any simple gin will do the drink. Both Gibson’s and Gordon’s make excellent Gin & tonics this way.
Perfect cocktail.
After reading the comments did some research. Took a recipe from pre-Prohibition, a recipe from Victor Bergeron (Trader Vic) from 1947, and a cocktail book from 1953. Also went out to the websites of various gin makers to view their recipe.
Final cocktail had 1/2 lime, juiced into the glass. Lime was also put on the rim of the glass. Added ice and the gin. Stirred. Added tonic and more ice. Spent lime wedges were put on the ice.
You can also make a gimlet per Simon’s recipe then lengthen it into a gimlet-Collins: just add Soda water. Somewhat similar to this. I enjoyed it very much.