Place mulberries and 1 tablespoon of water in a large stainless-steel saucepan and cook until boiling.
Now set the heat to low and cook, covered for about 15-20 minutes, stirring frequently.
Meanwhile, in a non-reactive bowl, add the remaining water, sugar, gelatin, and pectin and stir until the gelatin is dissolved.
With a potato masher, mash the berries.
Stir in the sugar mixture and cook until boiling.
Divide the berry mixture into 8 (½-pint) hot sterilized jars, leaving about ½-inch space from the top.
Slide a small knife around the insides of each jar to remove air bubbles.
Wipe any trace of food off the rims of jars with a clean, moist kitchen towel.
Close each jar with a lid and screw on the ring.
Arrange the jars in a boiling water canner and process for about 10 minutes.
Remove the jars from the water canner and place them onto a wooden surface several inches apart to cool completely.
After cooling with your finger, press the top of each jar’s lid to ensure the seal is tight.
The canned preserve can be stored in the pantry for up to 1 year.