Rinse and dry oranges, then peel and remove white pith. Save the peel of one orange.
Filet oranges and juice in a bowl. Cut the reserved peel into thin strips and add to bowl. Juice lemon into the same bowl.
Add everything to a pot with gelling sugar and stir to combine. Bring to a simmer over medium-high heat. Then heat over low heat for approx. 10 min., stirring constantly. Pour into sterilized jars while hot. Seal and let cool completely. Enjoy!