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An orange has about 8,000 to 12,000 essential oil glands embedded within its rind. Inside each is a cocktail of terpenes, aldehydes, esters, and alcohols that contribute to the distinct aroma of orange zest. The pleasant aroma of citrus zest indicates that these compounds readily vaporize, which by definition makes them volatile. When it comes to flammable molecules, the more volatile they are, the easier they are to ignite.Flaming a twist of orange peel is classic bartender showmanship. But it&#39;s also flavor chemistry. Combustion splits and rearranges the various volatiles, resulting in new aromas distinctly different than fresh peel oil.Done with skill, it&#39;s mesmerizing to watch and adds a delicious nuance to a well-made cocktail.