Made per Dan's suggestion with no simple. Could add still more sour. As is the amaretto dominates and lime settles in at the end with just a touch of real sourness. Not a bad use for an ancient bottle of amaretto.

Updated to clarify ingredients, quantities, and method. Bitters corrected from Angostura Orange to regular Angostura.

The linked recipe calls for 1.5 t honey, not 1.5 oz.

Thanks. Fixed oz -> tsp.

Curated this. Removed grenadine from the drink - it's literally gin, lime juice and club soda. Tart!  Thanks,  Zachary

Good with two dashes of simple syrup (according to David Embury's advice). Refreshing, effervescent and tart.

I think few days are hot enough that I prefer my Gin Rickey "bone dry" as per this recipe. If it's the hottest day of the year, make this recipe.

Every other day of the year, I prefer the Death & Co recipe: 2 oz Gin (Beefeater); 1oz Lime Juice; 1/2 oz Simple Syrup; Club Soda (to taste).

I prefer the original, no sugar. Better than a martini or a tom collins if you just want an excuse to drink gin.

The recipe as currently listed is not the original, but rather an accidental variation by Damian Windsor (currently at Roger Room, Los Angeles) that I have posted on eGullet repeatedly.

The original is by Sam Ross (Milk and Honey, Little Branch, etc.).

1.5 oz Bourbon (Elijah Craig)
.75 oz Campari
.75 oz Carpano Antica
2 dashes Mole Bitters

Stir, strain, up, cherry.

This recipe was originally found on the Bitterman's website, but it's been removed.
It can be found in this book: http://books.google.com/books?id=hKgGjgbfhaUC&pg=PA76&lpg=PA76&dq=%22le…
However, it lists Bitterman's Sweet Chocolate Bitters, instead of the Mole Bitters.

Thanks, Campus Five. I've correct the recipe using the source you cited.

Wow! That's a perfect showcase for chocolate in bitters (I had to use Fee Bro's Aztec Chocolate, but that's close, nu? Same league if not the same ballpark.) Well played! 4 of 5, and 4.7 if there were 10th stars.

Good - but if I'm aiming for this, I prefer a Punt e Mes manhattan (2:1) with 2 big dashes of Bittermens Mole.

seriously yummy!

Significantly revised to be less orange, more ginger-forward, spicier, and less sweet.

I like this quite a bit.  It's like a spicier, orangey-er daiquiri. I almost want to throw a little club soda on top of it, cause I'm crude that way.  

I subbed the Cointreau with Clement Creole Shrub, which seemed to fit the other ingredients well with an agricole base. As such, I didn't use a high-hogo rum, opting for Gosling's (given the Bermuda homage) and Cruzan Blackstrap. Used Domaine and Canton ginger, Regan's orange bitters. Excellent.