01 - Wash the oranges and lemon thoroughly. Using a fine grater or zester, remove the zest from 2 oranges, avoiding the bitter white pith.
02 - Juice all 4 oranges and the lemon, straining to remove seeds and excess pulp. Reserve about 2 cups of juice.
03 - In a large saucepan, mix the orange juice, lemon juice, orange zest, and water.
04 - Sprinkle the fruit pectin evenly over the juice mixture and stir to blend thoroughly.
05 - Heat the mixture over medium heat, stirring constantly until it reaches a gentle boil.
06 - Add the sugar all at once and stir continuously until fully dissolved.
07 - Increase heat and bring to a full rolling boil. Boil hard for 1 to 2 minutes while stirring nonstop.
08 - Take the saucepan off the heat and skim off any foam from the surface using a clean spoon.
09 - Pour the hot jelly into sterilized jars, leaving a 1/4-inch headspace. Seal immediately.
10 - Process jars in a boiling water bath for 10 minutes for long-term storage. Allow jars to cool without disturbance.