The best lemonade is a classic recipe based on a sugar syrup infused with lemon zest, which is then mixed with fresh juice and served refreshingly with sparkling water or still water. In a jar with a tight-fitting lid, combine the sugar and the grated lemon peel, using a zester to avoid the bitter pith and capture the essential oils in the sugar. Very hot water is added to dissolve the sugar and, after shaking well, fresh lemon juice is incorporated. The mixture is refrigerated until well chilled. To serve, pour a portion of the syrup over ice cubes and top with cold sparkling water or still water, stirring to combine all the flavors. It is advisable to use high-quality lemons with good skin to ensure optimal flavor and to make the most of the aroma and freshness of this homemade lemonade.