01 -
Place 2 pounds (900 grams) of fresh or frozen mulberries, 6 cups (1.35 kilograms) of granulated sugar, and 1/2 cup (120 milliliters) of freshly squeezed lemon juice into a large, non-reactive pot. Bring the mixture to a boil over high heat, stirring constantly to dissolve the sugar and prevent scorching.
02 -
Add a pinch of ground nutmeg and stir in 2 (3-ounce) pouches of liquid pectin. Return the mixture to a boil and let it boil for 1 minute, stirring continuously.
03 -
Remove the pot from the heat and allow the jam to cool slightly. Skim off any foam from the surface. If not canning, let it cool completely and transfer to sealed containers for refrigeration or freezing.
04 -
Sterilize canning jars in boiling water. Use a ladle to fill the jars with jam, leaving 1/2 inch of headspace. Clean the rims of the jars with a damp cloth to remove residue.
05 -
Secure the lids on the jars and process them in a boiling water bath for 5 minutes. Carefully remove the jars and let them cool undisturbed for 12 to 14 hours.
06 -
Check that each jar has sealed properly by pressing on the center of the lid. Store unopened jars in a cool, dark pantry for up to 18 months. Refrigerate opened jars and consume within 2-3 months.