Wash the oranges and lemon thoroughly.
Cut the oranges into 1/8-inch slices, removing the seeds.
Cut the Oranges into quarters.
Place the oranges into an 8-quart stainless steel pot. Add the lemon zest and juice and the water to the pot, set over high heat and bring to a boil, [#10 minutes}.
Once brought to the boil, reduce the heat to maintain a simmer and cook, stirring frequently, for 40 minutes. Do Not allow to Burn.
Add the sugar and stir the mixture continually, until it reaches 222F
Sterilize the jars in boiling water.
when the marmalade nape's a plate - and holds a line, it is ready.
fill the jars with marmalade, top the jars.
return the filled jars to the pot with boiling water. Do not let the jar bottoms touch the bottom of the pan.
Simmer for another 10 minutes. Remove and sit at room temperature.
unopened - lasts for 6 months.