Lemonade is a soft fizzy citrus drink.
Kenny Falmouth had a stand selling it for a time on Plunder Island. He claimed it was "Even better for you than placing leeches on your tongue." He also claimed:
"It's a dandy tonic for scurvy. It'll cure all your symptoms, including, but not limited to: ...gradual weakening, aching muscles, sunken eyes, painful gums, ashen skin, loss of teeth... ...internal bleeding, the reopening of old wounds, diarrhea, kidney failure, fainting, halitosis and death."