Mandarin Orange Marmalade
Boil peel until slightly translucent, about 5 minutes.
Add this mixture together with peel and water into a large stainless steel pot and bring to a boil.
Fill into sterilized jars and seal with their lids and allow the jars to sit in a hot water bath for 10 mins. Remove and let cool at room temperature until you hear the "pop" of the button on the lid or when you notice the button has gone down. That means it's sealed properly and those jars will keep on the shelves unrefrigerated for months. Those that don't seal properly can be kept in the fridge.