After slurping down an oyster, many people return the shell to its bed of ice upside-down. Beyond showing your companions which oysters have been eaten, the move also offers a feeling of finality—of accomplishment. I ate that oyster! And yet, no matter how you flip it, that oyster shell is getting tossed in the trash like all the others. But the London seafood chain Wright Brothers has finally found a use for its oyster shell waste: making oyster shell gin.