Express Oils for Aromatic Cocktails
Citrus peels are densely packed with volatile aromatic compounds like limonene which are extremely light and spring up out of the glass, making them the first thing you notice. Bartenders express citrus peels to enhance or balance out a cocktail’s citrus notes without adding sweetness, giving you all the bright aromatics without turning your drink into a sugar bomb. The technique is simple yet transformative.
Hold the peel with the outside facing toward the drink, pinch the sides together to bend it outwards, stretching the surface to the point of breaking its cells and expelling their essential oils. Professional bartenders understand that distance matters too. To get a more subtle citrus flavor, squeeze the peel 5 or 6 inches above the drink so less of it ends up in your cocktail. This works especially well for delicate drinks like the Sazerac where you want just a hint of lemon rather than overpowering citrus.
Flame the Peel for Drama and Depth
The technique of flaming citrus peels was pioneered by Pepe Ruiz, a bartender who created the Flame of Love cocktail for Dean Martin in the 1970s, composed of vodka and sherry and finished by giving an orange twist a quick burst through fire. It’s theatrical, sure, but there’s science behind the spectacle.
When you squeeze or express the peels over a flame, the oils get caramelized, and some bartenders say this reduces the bright character of the citrus oil and imparts a delightfully smoky profile to the drink. This technique pairs beautifully with darker spirits. Sharply squeeze the pith-side of the peel a few inches from the flames so the essential oils spray from the rind to create a quick flashpoint over the cocktail, then rub the peel around the glass rim before dropping it in.
Create Oleo Saccharum for Punch and Cocktails
Oleo-saccharum is Latin for ‘oil-sugar’ and is the name given to the syrup made by using sugar’s hygroscopic property to extract the fragrant natural oils in citrus fruit peels. This old technique is making a serious comeback in craft bartending. Many professional bartenders use the oleo saccharum technique to get additional life out of partially-used citrus, such as lemon slices or peels that were cut for garnishes but not used by the end of the night at the bar.
The process couldn’t be simpler. Toss citrus peels and white sugar in a bowl, gently muddle, cover, and let sit for an hour or longer as the sugar draws the oils from the lemon peels, creating a rich, glossy citrus syrup. Bartenders use vacuum sealing to do the work now, making the process a little easier to keep an eye on, though you can also use a ziplock bag if you don’t have a vacuum sealer. Use it in place of simple syrup in Old Fashioneds, Whiskey Sours, or hot toddies for an incredibly intense citrus dimension.
Dehydrate Wheels for Sustainable Garnishes
Dehydrated orange, lemon, and lime wheels are still going strong because they’re easy to prep, reduce waste, and add both visual pop and aromatic depth to the final pour, and unlike fresh slices, dried citrus holds its shape and color throughout service. a trend that gained popularity around 2023 and remains strong.
To dehydrate at home, turn on your oven as low as possible (200 degrees F for most ovens), cut your citrus into thin wheels, place the wheels on parchment paper on a baking sheet, and the process will take about a day. Dehydrated wheels can be stored in a glass jar at room temperature and will keep for about a month, and can also be rehydrated when needed. These zero-waste techniques continue to grow within the industry.
Make Candied Peels After Oleo Production
After making your flavored sugar or syrup oleo, you’re left with flabby, wet, sticky citrus peels that can no longer spray oils atop cocktails in garnishes, but you can place them in a food dehydrator or in the oven on a cooking sheet set at the lowest temperature, and after several hours or overnight, the result is dry, crispy, candied citrus peels. These aren’t trash at all.
Now they’re preserved as candy, so you can store them in an airtight container and use them when needed in the future, meaning if you plan it right, you can use a single piece of citrus fruit for its fresh juice, to make flavored sugar/syrup oleo saccharum, and as an edible peel garnish. Talk about getting your money’s worth from one lemon.
Infuse Spirits with Leftover Peels
Scenting cocktails with citrus oils is one of the oldest mixology techniques still used today, and bartenders have found ways of reusing the citrus skins that have been used for expressing oils onto drinks. One clever approach is creating citrus sprays. The citrus flavors are preserved within a spirit, which means they have a very long shelf-life, they are fast and easy to use and require no additional prep, and they can be stored up into different flavors: Grapefruit, Blood Orange, Lime, whatever.
Simply collect your used peels in a jar, cover them with high proof neutral spirit or vodka, and let them sit for several days. They can be flammable which means that they can express burnt citrus flavors for flair as well as for their unique aromas on a drink, but be careful and proceed with caution when dealing with flammable objects. Strain into spray bottles and you’ve got yourself a bartender’s secret weapon.
Craft Citrus Powder for Cocktail Rims
You can grind up dehydrated citrus wheels in a spice mill to create a powder, and mix with some sugar or salt and you have a very delicious and beautiful rimming sugar or salt for cocktails. This technique has gained traction in high end bars looking to add layers of flavor and visual appeal.
Dusted rims using citrus-infused salt, sugar, or Tajín are making a comeback in 2025, often pairing with a dried wheel garnish for a double-hit of flavor and flair. The powder can also be incorporated into baking, sprinkled over desserts, or mixed into compound butter for an unexpected citrus kick. It’s surprisingly versatile and can be stored for months in an airtight container.
Preserve Essential Oils for Later Use
Eco-conscious bartending is becoming standard, and from reusable straws and compostable garnishes to upcycling citrus peels and minimizing waste, sustainability is built into the craft. The bonus of making an Oleo or other citrus preservation is the way it reduces waste, and with the renewed focus on sustainability, making sure we are maximising ingredients has become standard practice for most bars, and there’s no reason this can’t be the same at home too as making an Oleo Sacchrum is a great way of ensuring you achieve zero waste from your fruit bowl.
Citrus aroma depends on the composition of the volatile compounds in citrus essential oils which are mostly located in the peels, and during extraction, a specific series of chemical reactions occur depending on the extraction methods, leading to variations in the composition of volatile compounds. Whether you flame them, express them, dehydrate them, or soak them in sugar, bartenders have proven that citrus rinds deserve respect. Next time you juice a lemon or lime, think twice before tossing that peel. What would a bartender do?
