Tequila is not just a  fast ticket to Margaritaville. It's not just for summer. And it doesn't need to be chased by lime and salt to hide the taste.  It's now being seen as an upscale spirit, the whiskey of blue agave. And it's getting top shelf treatment.

Jonathon Alsop, founder of The Boston Wine School, dropped by to school us on how — and why — tequila is getting a makeover.