Classic lemonade with lemon

350 g of sugar;
2 liters of water;
350 ml freshly squeezed lemon juice
Pour sugar into a small saucepan and pour 250 ml of water. While stirring, bring the liquid to a boil over moderate heat and cook until the crystals dissolve.
Cool syrup to room temperature and refrigerate. Then mix the solution with the remaining water and lemon juice.