Arguably the *BEST* margarita is found at Su Casa, La Jolla, CA. Otherwise homemade is best, if you use good quality ingredients.:)
Did some catalog and online work for an Ayurvedic nutraceutical company there before the economy went bust, but didn’t know of that place at the time, so I missed it.
Other than making your own, it works best to get to know a bartender who knows what he or she is doing, with a well-stocked bar backing them up. They’re very willing, even excited, to try new things and have a good sense of what will or won’t work, much as a good chef would know with food.
As a for instance, I went out for the evening with an old friend, did something of a bar crawl for old times sake even though I’m completely out of the habit these days. We walked into a new place downtown out of curiosity, and studied their stock of liquors. Saw a bottle of St. Germaine, can’t say I’ve ever seen it before. Decided to try it, asked for recommendations and ended up with an awesome drink involving Patron and St. Germaine. Reminded me of a good homemade limoncello but with a kick, lol.