Charles H. Baker Jr, my favorite dilettante and day drunk, introduced the world to many fabulous cocktails (and if you recall the coconut-cachaça incident, a handful of stinkers). The Mexican Firing Squad Special is one you won't regret trying, though you may find it difficult to stop sampling it.
Mexican Firing Squad Special
2 oz tequila
1/2 oz freshly squeezed lime juice
1/2 oz grenadine
2 dashes Angostura bitters
1 dash orange bitters
Combine ingredients in a shaker with ice; shake vigorously for 10-15 seconds. Double strain into a rocks glass over fresh ice.
Notes: We use reposado tequila in all our at-home recipes, but a blanco tequila would be lovely here as well. Do your best to find high-quality grenadine, and if all there is is Rose's, try a pomegranate syrup instead. Cheers!