Squeeze the oranges and pour the juice into a jug that can hold at least 1.5 liters or something similar. Wash the lemon, preferably organic, as the zest goes with the lemonade, cut into slices and add. Add the mint and the syrup, I use homemade ones that taste more natural. Top up with ice and the sparkling water as desired. If you like it sweeter, you can add more syrup to taste.
If you let the lemonade steep for another 20-30 minutes, the mint flavor comes through even better.