Lemon and Mint drink I once had a delicious lemon and mint drink on a flight with Qatar airways, but I have no idea what it was or how it might have been made. Does anyone know what it might have been and how it was made?

Edit

I'm not sure if it was made on board or not. It wasn't carbonated but it was chilled when it was served. It did have a slight syrupy consistency like there might have been some sugar syrup in it. There wasn't any alcohol in it and I couldn't make out any other flavours.
There's a lovely middle-eastern recipe for mint lemonade.
I used to make loads of this stuff in my navy days.
So, for a jug serving six sailors:


Juice of about 2-3 lemons
Six tablespoons of sugar
nice handful of mint


Put the mint and sugar in the jug and pour about half a cup of boiling water. 
Stir well, and leave for a few minutes so that the mint can think about what it has done.
Add lemon juice and water slowly while stirring.

The amounts may not be precise, as I used to make this in an eight gallon saucepan, and these days I make it in a 2-cup shaker.