I just made this for the first time today because it's been so hot and I must say it's the BEST lemonade I've ever had!
I had 4 medium sized lemons that needed using up so I threw them into the 3 pints of water and added about 200g of sugar at the end. The result was very strong but after adding a little bit of water and some ice, this lemonade is perfect!
It's much better to cook the lemons than just mixing everything with cold water. The result is a lot smoother, and refreshing taste.