You know those key limes you keep walking by in the grocery store, wondering if and when you should buy them? Well, they’re worth grabbing on your next trip — they’re the secret to making the best and freshest margaritas ever.

That’s according to Gina McClelland, manager at Guero’s Taco Bar in Austin, Texas. While many restaurants, bars — and even generations of families — try to keep the ingredients of their best-selling margaritas to themselves, on this National Margarita Day (Feb. 22), McClelland felt it was important to “reveal” that the best margaritas are simple.

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“We take one ounce of tequila, half an ounce of cuantro — an orange-flavored liquor — and half an ounce of lime juice, hand-shake it and pour it over ice,” she told LifeZette.

Guero’s is considered one of the best stops for dinner and a margarita in the Austin area.

For fans of the frozen variety, the mix is simply poured into the blender with ice, crushed and served.

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“They’re very easy to make, delicious, and keep you from hurting people,” McClelland said, laughing. “Margaritas make our customers happy. The citrus is always fresh — and the drink itself freshens things up, too. It’s a thirst quencher. And tequila — we use an agave-based tequila.”

It’s a delicious drink overall (consume in moderation, please!).

For those who are not fans of traditional margaritas, the beverage is certainly celebrated in many other ways. No matter how you like your margarita, enjoy!