An edgy London ice cream parlor called Icecreamists is dishing up ice cream made from human breast milk. The flavor is named Baby Gaga, and today the shop posted a sign in its window letting customers know they had sold out of it. The unusual dessert, also made with Madagascan vanilla pods and lemon zest, is a huge hit with Londoners.

Victoria Hiley, 35, of Leeds sold her milk to the ice cream shop after responding to an Internet ad. She was paid 15 pounds (about $24) for every 10 ounces of milk.

“What’s the harm in using my assets for a bit of extra cash?,” Hiley told the British Metro newspaper. “There’s nothing more natural than fresh mother’s milk.”

So far 15 other woman have signed up to sell their liquid gold to Icecreamists. All donors must undergo the same health tests the UK’s National Health Service requires when screening blood donors.

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Last year, Manhattan chef Daniel Angerer tempted Americans with cheese made from his wife’s breast milk. It wasn’t received as well as Baby Gaga ice cream and the health department asked him to take the cheese off the menu at his Klee Brasserie restaurant.

Icecreamists owner Matt O’Connor, 44, doesn’t understand why anyone wouldn’t want to eat something made with breast milk, “It’s the most beautiful thing,” O’Connor told the BBC. “It’s oarganic. It’s free-range. It’s totally natural.”