Ketel One Vodka is partnering with Bourne & Hollingsworth in London to host a month-long indoor garden pop-up focused on sustainability. By turning used coffee grounds from Bourne & Hollingsworth’s espresso martinis into compost for an indoor garden, Ketel One aims to educate consumers about the alternative ways to reuse and recycle their coffee grounds.

The Ketel One Espresso Martini Garden will feature a cocktail menu highlighting a variety of quirky takes on the espresso martini. It’s Ketel One’s goal to raise awareness of the 500,000 tons of spent coffee grounds that are sent to landfills each year. 

Those who attend the pop-up can also attend masterclasses hosted by gardener and sustainability expert Julius Roberts. He will share tips on repurposing spent coffee grounds while Ketel One brand ambassador Kate Jackson will demonstrate how to mix up sustainable cocktails at home. All remaining spent coffee grounds from the pop-up will be donated to natural and organic skincare brand UpCircle for use in the brand’s products.

The martini garden pop-up is open for free to Londoners now through the end of November.

Capitalizing on millennials’ concern for the environment and love for immersive experiences are central to Ketel One’s strategy. A Harris Group study found that 72 percent of millennials prefer an experience over a material item. Similarly, in a survey from Cone Communications, 87 percent of millennials believe that companies should address urgent social and environmental issues.

Ketel One, a Diageo-owned company, said it grew sales grew by 22 percent in North America in the six months through December 2018. Diageo CEO Ivan Menezes recently told investors that the brand’s Botanicals line has brought new consumers into the franchise.