Roll the lemons on the worktop in a circular motion or roll between your palms. This is so they are easy to juice.

Cut each lemons into 2 equal parts and juice.

Pour the freshly squeezed lemon juice into a pitcher then add in 2 liters of cold water.

Add in sliced lemons (Optional) and sugar if using.

Stir well and put in the fridge to chill for at least 30 minutes or immediately serve on ice.