Two posts today! But I don't think I've posted this recipe yet, and it is so very good when one is poorly, as I have been the last few days. In an ideal world, you will possess a large plastic jug - holding maybe 2 litres. We have a lovely one that fits into the door of the fridge. But you can use a plastic measuring jug for the first bit, and then transfer into a non-heatproof jug when it has cooled a bit.
3 level tablespoons granulated sugar
Peel the lemons with a vegetable peeler or zester or similar, being careful to get as little of the white pith as possible. Put the peel and the sugar into a heatproof container, and cover with boiling water. Stir vigorously until the sugar has dissolved. Now add the juice of the lemons, and about a litre of cold water, and then a tray of ice-cubes. You'll probably drink the first glass straight away, but put it in the fridge to chill right down. It will keep about 24 hours in the fridge, but may well not last that long!