Place the lemon zest and sugar in a saucepan and pour ¾ cup (200 ml) of water over it. Mix well, bring to a boil over high heat.
It is the white pith that can give a lot of bitterness to the lemonade. It is therefore necessary to get the pulp by completely getting rid of all the white skin (pith) and to get the zest in the same way. Patience and quality of the peeler are very important.