Slice the oranges as thinly as possible. Cut into quarters.
Take out all the seeds.
Wherever the pith ( white part under the skin) is too thick, you can cut that off.
Place a small bowl or plate in the freezer. This is for testing the jam.
Place the oranges, with their juices into a saucepan.
Add water, sugar, and ginger.
Bring the mixture to a boil on medium heat. Once it boils, lower the heat to low.
Cook for about 40 minutes, stirring occasionally. When the mixture starts to look thick, take it off the heat.
Put a spoonful on the chilled plate or bowl. If the jam wrinkles up when you push it lightly with your finger or a spoon, your marmalade is ready. If not, put it back on heat for a few more minutes.
Carefully spoon the marmalade in clean, sterilized jars. Seal tightly.
This should last about 3 weeks in the refrigerator. Enjoy!