I ordered this in a coffee shop in Hamburg the other day when I was very hot. Not at all sure what to expect, but it was very good and refreshing, so I tried to recreate it at home:
1 peppermint tea bag
2 large sprigs mint
Several slices of lemon (I freeze 1/4 slices of lemon to go in tea, so just grabbed a handful of those) or lime
As many ice cubes as you can muster
Orange, apple or multi-vitamin juice
Make 1 cup of peppermint tea and add the mint sprigs, too - crush them for a bit of flavour. Cool it down with the ice-cubes and lemon. Add fruit juice to taste - and it might, I suspect, be very nice with some sparkling water, too.
Most refreshing. Please note this is still a work in progress.....