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A jar of homemade blackberry jam with fresh blackberries on a wooden surface.

Blackberry Jam (Homemade)

A sweet and tart homemade blackberry jam, perfect for spreading on toast, pairing with desserts, or as a thoughtful gift.
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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings: 4 jars
Calories: 50
Ingredients Equipment Method Notes

Ingredients
  

Main Ingredients
  • 4 cups fresh blackberries
  • 4 cups granulated sugar
  • 2 tablespoons lemon juice

Equipment

  • Large Pot (or Dutch Oven)
  • Potato Masher (or Fork)
  • Canning Jars (with Lids and Bands)
  • Ladle
  • Large Spoon
  • Small Plates (for testing)

Method
 

Preparation
  1. Wash the fresh blackberries thoroughly and gently crush them in a large pot or Dutch oven.
  2. Combine the crushed blackberries with granulated sugar and lemon juice in the pot.
Cooking the Jam
  1. Bring the mixture to a full rolling boil over high heat, stirring constantly to prevent sticking.
  2. Reduce heat and continue to boil for about 15-20 minutes, stirring occasionally, until the jam thickens and reaches the setting point.
  3. To test the setting point, place a small amount of hot jam on a chilled plate; if it wrinkles when pushed with a spoon, it's ready.
Canning and Storage
  1. Carefully ladle the hot jam into sterilized canning jars, leaving about 1/4 inch headspace.
  2. Wipe jar rims clean, apply lids, and process in a boiling water canner for 10 minutes to ensure a proper seal and shelf stability.

Notes

Ensure your canning jars are properly sterilized before filling to prevent spoilage. The setting point can vary, so use the cold plate test as a reliable indicator. For a seedless jam, press the cooked berries through a fine-mesh sieve before adding sugar and continuing to boil.