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.