Peel the well washed orange very thinly so that only the peel and not the white goes with it.
Then squeeze the orange, this makes about 100 ml.
Put the zest with the juice and the remaining ingredients in a wide-necked bottle. Close tightly and shake well. Place in a sunny place and let it steep for 14 days. Shake every now and then so that the rock candy dissolves.
After 14 days, first strain the contents of the bottle and then filter twice (I use these long paper tea filters that can be folded down at the top).