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Home Science

Climate-Friendly Cocktail Recipes Go Light on Ice

June 18, 2023
in Science
Climate-Friendly Cocktail Recipes Go Light on Ice
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Ice was originally harvested in large blocks from frozen lakes, then shipped to areas with hotter climates. Credit: Historic Collection/Alamy Stock Photo


As any bartender will tell you, a cocktail flung back and forth over ice inside a shaker gets cold very fast. “The amount of energy you get from melting ice is phenomenal,” Arnold told me. Calculator in hand, he explained that if you shake three and a half ounces of tempered ice for 12 seconds, you’ll generate about 2,000 watts of power on average. This amount is roughly the maximum load that can be safely drawn from a typical American home’s electric outlet. “There’s no real other way to … extract that much heat from something as quickly,” Arnold said.


How much ice does an average bar use? According to Todd Bell, senior energy analyst at energy-efficiency consulting group Frontier Energy, the amount “really depends on the operation.” It might be between 200 and 300 pounds a night or far more.


“The ice-making procedure in bars is crazy wasteful,” Arnold says. “It’s kind of just built into the way [bars] operate things.” Energy wasted from ice is largely because of in-house ice machines, which many—if not most—bars and restaurants use to maintain their steady ice supply. Ice machines run continually until they are full, potentially for several hours at a time. The machines vary widely in terms of the amount of energy they draw, however, depending on whether they are air- or water-cooled.


As the names suggest, air-cooled machines use air to transfer heat out of their systems, and water-cooled machines use water to do this. Well-maintained water-cooled machines are on average more energy efficient than those cooled by air, but they require much more water to produce ice. In nature, it takes only about 12 gallons of water to make 100 pounds of ice, Bell says. But water-cooled ice machines can require up to 100 gallons to produce 100 pounds, an amount so egregious that the U.S. Department of Energy’s Federal Energy Management Program now restricts the installation of water-cooled ice machines except in buildings with cooling towers. Although air-cooled machines waste less water, many on the market still require more than 12 gallons of water to make 100 pounds of ice. In most cases, any unused water or ice at the end of the night is left to run down a drain.


Most bars aren’t likely to give up ice altogether anytime soon. And cocktails aren’t unsustainable just because of all the ice and water they require; they also tend to rely on ingredients that are shipped from far away, such as lemons and limes and liquors from around the world. But some bartenders are reimagining how ice and other ingredients can be used more sustainably. At Eve Bar in London, a new zero-waste menu includes cocktails made with leftover ingredients from its partner restaurant, Frog. The Bone Yard martini, for instance, uses vodka redistilled with venison bones to add a “bone marrow flavor” similar to what’s found in some versions of the Bloody Mary. The technique is called a fat-wash because it lends the drink a savory flavor. “Whenever a dish [at Frog] changes, a cocktail [at Eve] changes,” says Adam Handling, the chef and owner of Eve Bar.


To mitigate its waste, Eve Bar forgoes an ice-making machine for 55-pound blocks of ice, which are delivered to the bar by a local ice company. Eve’s bartenders precut the block ice to “fit perfectly” in every type of glass used, he says, so that no ice gets wasted. For cocktails that traditionally call for the use of crushed ice, such as tiki drinks, the bar uses liquid nitrogen instead. “We don’t use crushed ice at all,” Handling says.


Three images of ice in glasses.
Making a cocktail requires lots of ice. A mixing glass (left) is filled with ice for diluting and chilling liquids; a rocks glass (center) is prechilled with ice water. All that ice will be dumped out and replaced with a fresh, large cube (right) to serve the drink. Credit: Lendon Flanagan


Jennifer Colliau is a sustainability-focused “cocktail nerd” who designed a bar menu that used as little ice as possible at The Perennial, a restaurant in San Francisco that closed in 2019. Colliau read about what Arnold has called the “science of shaking” and the “science of stirring” to devise ways to use less ice without affecting the taste and texture of cocktails. “Once you understand the role that dilution plays in drinks,” she says, “you can control it in different ways.” One method of eco-friendly cooling that she would never consider is whiskey stones, those small cube-shaped rocks made of soapstone or stainless steel that are sold as ice alternatives. “Whiskey stones are so stupid,” she says. “You can make the stones cold, and you can put them in your whiskey, but [because they don’t melt] there is so little thermal transfer of energy that your whiskey won’t get cold.”


To achieve dilution without ice, Colliau would measure a precise volume of water and add it to bottles of prebatched drinks that don’t require fresh juice, such as martinis or manhattans. Juice will “oxidize over time,” she says, and “start to taste nasty.” This approach ensured consistency across her preassembled cocktails and eliminated the practice of throwing ice down the drain after shaking or stirring. Similarly, Re-, a bar in Sydney, Australia, serves most of its cocktail classics prediluted. “We never throw ice away,” co-owner Matt Whiley says. The bar’s machine is set to create only what’s needed, “so it’s empty at the end of the night,” Whiley explains. Their drinks are made from food ingredients that tend to go to waste, including bread, dairy, bananas, rice and root vegetables. To serve those cocktails, Whiley uses ice carved from “off cuts”—slightly deformed blocks that his local ice-delivery company probably couldn’t sell otherwise and would just let melt away.


When the same ice that is used to shake or stir a drink is used to serve the drink, it’s called a “dirty dump,” explains Camper English, author of The Ice Book: Cool Cubes, Clear Spheres, and Other Chill Cocktail Crafts. “It’s not a common move,” he says, because it can send bits of herbs or fruit into the drink, causing it to look “frothy, cloudier and chaotic in the glass.” The move should also be avoided with any drink requiring fizzy liquids such as soda water because “smaller ice fragments provide more nucleation points that flatten the [liquid’s] carbonation and block the surface of the cocktail,” which prevents the tiny bubbles from rising out of the glass. But English actually prefers some drinks served this way, such as a mai tai or a margarita on the rocks, whose aesthetics and noncarbonated ingredients lend themselves well to the dirty dump technique.


Such resourceful approaches to bartending might signal the start of a shift—particularly for the U.S., where the ice trade was larger than anywhere else in the world. When Tudor launched his business more than 200 years ago, he probably never anticipated how consumed America would become with ice. Perhaps that’s one reason ice is still somewhat rare in international cocktails. Consider the French Kir Royale, which consists of just black currant liqueur and champagne—it’s almost always served neat. Or Hungary’s Fröccs, which is made with soda water and wine and is “always served chilled” but “never over ice,” according to Afar magazine. Drinks in this style—refreshing but not frigid; based in spirits, liqueurs or wines made from local fruits and herbs—could be front-runners in an energy-efficient, climate-conscious cocktail movement.

This article was originally published with the title “Shake, Chill, Froth, Dilute, Discard” in Scientific American 329, 1, 82-87 (July 2023)

doi:10.1038/scientificamerican0723-82

ABOUT THE AUTHOR(S)

author-avatar

    Amy Brady is executive director of Orion magazine and a contributing editor at Scientific American. She is author of Ice: From Mixed Drinks to Skating Rinks–a Cool History of a Hot Commodity (G. P. Putnam’s Sons, June 2023). Credit: Nick Higgins

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