Cut the lemons in half and use a juicer to extract the juice. Fresh juice is key for that authentic flavor.

Measure out the sugar and set it aside. This will balance the tartness of the lemon juice.

In a pitcher, combine the freshly squeezed lemon juice and sugar. Stir until the sugar fully dissolves, which may take a couple of minutes.

Pour in the cold water to the lemon-sugar mixture. This helps dilute the strong lemon flavor.

Taste and adjust sweetness by adding more sugar if necessary.

Chill in the refrigerator for about 30 minutes to let flavors meld.

Fill glasses with ice cubes and pour the lemonade over the top.

Add lemon slices for garnish, serve cold and enjoy.