As many bartenders know, one of the secrets to a tastier drink is playing with fire.

Flaming an orange (or any citrus, really) is an old trick that looks impressive, but why does it work? First off, there’s a lot of flavor stored in the peel—that’s the whole reason you order drinks “with a twist.” That flavor comes from volatile oils stored in the skin’s many pores, including a compound called limonene. Besides having a strong orange aroma, limonene is a hydrocarbon just like petroleum, making it extremely flammable.

As for the introduction of a miniature fireball, its the same principle as many other foods: caramelization. Heat is what makes toast better than regular bread (if you disagree, fight me), and what turns a one-note orange flavor into a complex addition to a negroni variant. It’ll also impress the hell out of your friends.

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