Description
Unlock the vibrant flavors of summer with this easy-to-follow Homemade Blackberry Jam recipe. Enjoy a perfectly set, deliciously sweet, and tangy jam that’s far superior to store-bought varieties.
Ingredients
Scale
- 8 cups fresh blackberries (about 2.5 lbs)
- 6 cups granulated sugar
- 1/4 cup fresh lemon juice (from 1–2 lemons)
- 1 packet (1.75 oz) powdered fruit pectin (optional, but recommended for beginners)
Instructions
- Preparation: Wash blackberries, removing stems. Sterilize canning jars and lids by boiling for 10 minutes; keep hot. Gather equipment.
- Cook Berries: Place blackberries in a large, heavy-bottomed pot. Cook over medium heat, mashing gently, for 5-10 minutes until soft and juicy. (Optional: press through a sieve for seedless jam).
- Add Sugar and Lemon Juice: Stir in powdered pectin (if using) until dissolved, then add granulated sugar and lemon juice. Bring to a rolling boil over medium-high heat, stirring constantly until sugar is dissolved.
- Cook to Set Point: Continue boiling vigorously, stirring frequently, until the jam reaches 220°F (104°C) on a candy thermometer, or passes the cold plate test.
- Skim and Jar: Remove from heat and skim any foam from the surface. Ladle hot jam into hot, sterilized jars, leaving 1/4 inch headspace. Wipe rims, center lids, and screw bands finger-tight.
- Process: Process jars in a boiling water bath canner for 10 minutes (adjust for altitude). Carefully remove and cool on a towel-lined counter until sealed.
- Prep Time: 20 mins
- Cook Time: 30-40 mins