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“Every great cocktail has four components,” explains Nils Westlind of Latin American-inspired restaurant and bar Ronero. “You need a base spirit, something sweet, something sour and something bitter.”

To that end, Ronero’s Boca do Rio ($13) balances four ingredients, each fulfilling a singular role in a well-crafted whole that’s greater than the sum of its parts.

The base spirit, Absolut Elyx, is a premium vodka, probably the most recognizable element in the mix.

Adding sweet-tartness is grenadine, made in-house from a mix of pomegranate, sugar, hibiscus flowers and acai, an antioxidant-rich berry native to Brazil.

Lemon juice amps up the sourness.

Feni, surely the most unusual ingredient in Boca do Rio, is a bitter brandy made from the fleshy applelike sheath that surrounds cashew nuts; it has earthy hints of black pepper and coconut. The trick with Feni, says Westlind, is “not using too much. We use a half-ounce.”

But wait — a fifth ingredient? Before serving, Westlind pours a topper of sparkling wine, which both lightens the cocktail and adds everyone’s favorite party trick: bubbles. I’ll clink to that.

Ronero, 738 W. Randolph St., 312-600-6105, www.ronerochicago.com

David Hammond is a freelance writer.

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