You won’t believe the difference that some fresh citrus makes. There’s no sour mix in this classic Amaretto Sour, $12, at The Still. It will change your perspective on the regular drink.

Andi Berlin / Arizona Daily Star

Here’s a little secret: Next time you finish your Neapolitan pizza at Vero Amore, try walking around the open kitchen to the large mirror decorated with Chianti bottles. It’s actually a door. And if someone decides to let you in, you will find a sleek turn-of-the-century bar serving some of the most outstanding cocktails in town.

But first, you have to text in your reservation. The Still is a modern speakeasy, and they won’t let just anyone in off the street. They want to keep it mysterious, so like many other speakeasies in this national trend, they shy away from photography and social media hype. Their Yelp account has no pictures and their Facebook address is “somewhere in Tucson.”

But here they are! And you really need to pay them a visit ... East Coast-trained bartender Tiffany Eldredge is all about simplicity and craft. None of the drinks on her menu — which she completely changes out every two weeks — have more than six ingredients. And all of them feel like classics: the Apricot Fizz with egg white and apricot brandy, or the De La Louisiane rye drink with Benedictine and an absinthe rinse.

It wasn’t on the menu, but Eldredge insisted I try her Amaretto Sour. This cocktail usually isn’t at the top of my list — because I’m not a middle-aged lady wearing sneakers at a casino, at least not just yet! — but I decided to give it a go.

Wow. I couldn’t believe what a difference some fresh citrus makes. There’s no sour mix in here, just lemon juice, simple

syrup and Serata Amaretto

shaken with an egg white to froth it up. And that’s why it’s so delicious. The acidic lemon really cuts the richness of the Amaretto, making the drink feel fresh and sunny on your palate. In her words, “It tastes like an almond cake,” a perfect drink that you just want again and again. But be careful, this isn’t exactly a party. Over here, we’re sophisticated!

Classic Amaretto Sour

1 egg white

3/4 ounce simple syrup (cook equal parts sugar and water together on the stove)

3/4 ounce lemon juice

2 ounces Amaretto liqueur

Separate the egg white from the yolk and pour into one half of the cocktail shaker, or another glass.

In the other half of the shaker, pour in lemon, simple syrup and Amaretto. Combine egg white with liquid and shake without ice until frothy. Add ice and shake a second time. Strain contents into chilled glass. Enjoy!

You can find the Star's digital food writer Andi Berlin at a taqueria near you, taking tiny bites and furiously scribbling into an old notepad.