Based on the Limmoncello recipe found in this forum, obviously amounts needed to be changed because orange has a different bitterness and flavour.
start with 700ml of neutral, the higher ABV the better, Mine is usually around the 95% ABV
Peel 2 large oranges with a potato peeler, you want the zest (orange part) not the pith (white part under it). An ordinary potato peeler does a good job, no need to rasp.
Steep the orange peels in the neutral for a few days and you will find the aroma and colour will go orange.
Next filter it out through a cloth to remove any stray bits.
then mix 950ml of warm water with 300gr of sugar and let it dissolve. Stir as required
Pour the two together...
Put it in the freezer a few hours before drinking
Enjoy on a hot day, its super refreshing.