It was invented so Olympic bartenders wouldn't be overwhelmed — for the 1952 Helsinki Games, the state alcohol monopoly pre-mixed and bottled gin with grapefruit soda so venues could pour drinks fast for the crowds.
Lonkero is a carbonated highball of gin and grapefruit soda, sold pre-mixed in cans and bottles as well as poured fresh. It's tart, fizzy, and refreshing; its Finnish nickname, meaning 'tentacle,' is a play on the English term 'long drink.'
Muikku (Fried Vendace)