Growing up in the States, I recall seeing fresh lemonade available where ever we went. Alas, the UK has a different version of lemonade that doesn't pack the citrus punch
I've used this lemonade in place of standard tonic for G&Ts
First using a potato peeler, peel the zest off the 6 lemons. Try not to take too much pith (white flesh) as this can make the drink bitter
Once the zesting is done, juice the lemons
Add the sugar into a sterilised Kilner jar or large pitcher
Pour in the lemon juice and zest and a little bit of the boiled water and stir the sugar until it dissolves
Add the rest of the water and let cool on the side before going into the fridge
It's best left for 24 hours but even left overnight in the fridge still gives a nice refreshing glass
Depending on how 'unclouded' you want the drink, pass it through a sieve if not an issue or pass through a sieve and coffee filter it is an issue
Serve chilled with a slice of lemon and ice