For over a decade we have enjoyed the free spiced jicama sticks that many bars in MX serve (though rarely in our neck of the MXN woods). I tried at home to replicate them, using lime juice and various spices and never got it right. A few weeks ago I got a tamarind margarita and the rim had the BEST spice mix...nice salty crunch, some heat and a good sour. I asked the waiter what he used and he came back with the Tajin jar. Duh....I have seen it in the spice aisle for years but never knew what it was.
It is addictive. We put some on grilled corn on the cob last night and it was fabulous.