Found this recipe in some old indian cookbook (The Indian Cookery Book from circa 1900).
It says: "Put some bruised fresh-gathered mint-leaves into a large tankard, and pour over them a bottle of beer well iced, and a soda-water bottle of sparkling lemonade, also well iced; or use bottled mint-juice if the beer and lemonade have not been iced, and stir in a quarter of a pound of crushed ice."
Will try this soon, using either some Kingfisher or Namaste beer. Pretty sure I have some recipe for indian lemonade somewhere too.
Beer plus lemonade is quite popular in Germany (especially in the warmer months) and called "Radler".