Léchez la glace et elle se met à briller ! Une crème glacée fluorescente à base de méduses (en anglais)

Lick Me I'm Delicious, une entreprise anglaise, a créé une crème glacée fluorescente à partir de protéines extraites de méduses bioluminescentes.
Lick Me I'm Delicious, a UK firm, has created a glow-in-the-dark ice cream made from jellyfish proteins, which costs USD 225 a scoop.

Some types of jellyfish give off a green bioluminescence thanks to a natural protein. Lick Me I'm Delicious worked with a Chinese laboratory to synthetize the proteins into an edible powder. Charlie Francis, the inventor and founder of the firm, says that the specially extracted proteins interact with pH levels on the human tongue so the ice cream radiates light when licked. 
The natural taste of the synthetized jellyfish is described as faint and slightly sweet. The company added vanilla flavoring to the ice cream.

At USD 220 one scoop, even the inventor admits that it is quite expensive. The reason is the production process: to get to the market, it needs to go through organization to check the toxology. Charlie Francis expects mass-produced glow-in-the-dark ice cream in probably a year and a half.