The flavor of this potent cocktail is fruity thanks to a hint of slime—aka lime. Mix tequila, juice blend, lime juice, and crushed ice in a cocktail shaker and pour for a bewitching, boozy brew.
Stir salt, lime zest, and file or green tea powder, if using, in a shallow dish. Put lime juice in another shallow dish. Dip rims of 8 shot glasses in juice, then in salt mixture, tapping off excess. Set aside.
Put tequila, juice blend, lime juice, and crushed ice in a cocktail shaker or pitcher. Shake or stir to combine. Pour through a fine sieve into prepared glasses, dividing evenly. Serve immediately.