It's a classic from 1937 Mexico City. I made it as close to the version in The Gentleman's Companion by Charles H. Baker. He says add grenadine or gomme syrup. I added a bit of both. It's still tart and stronger than a Mexican Firing Squad you'd get today. "Snap fingers at the consequences" as Baker says.
3oz good tequila blanco (I used Fortaleza)
2oz lime juice
1oz homemade grenadine
A barspoon of 3:1 homemade gomme syrup
2 dashes of angostura
Shake and double strain into a collins glass with cracked ice. Garnish with an orange slice, a pineapple slice, and a cherry