Ingredients
Jam Ingredients
- 4 cups fresh or frozen blueberries
- 1 1/2 cups granulated sugar
- 1 lemon (zested and juiced)
- Pinch of salt
Instructions
- Combine Ingredients: In a medium saucepan, stir together the blueberries, sugar, lemon zest, lemon juice, and a pinch of salt over medium-high heat.
- Bring to a Boil: Stir frequently as the mixture heats up until it reaches a boil.
- Simmer the Jam: Reduce heat to low and let simmer for 7 to 10 minutes, stirring occasionally while gently crushing some of the blueberries. Use a digital thermometer to check that the jam reaches 220°F, indicating it is properly thickened.
- Cool the Jam: Remove the saucepan from heat and let the jam cool for 5 minutes in the pan before transferring it to jars.
- Set and Store: Leave the jars unopened to come to room temperature before sealing them. Store in the refrigerator where the jam will fully set within 24 to 48 hours, though it can be eaten immediately.
Notes
- Use fresh or frozen blueberries; either works well for this recipe.
- Crushing some blueberries during simmering helps release natural pectin, aiding in the thickening process.
- Use a candy or digital thermometer to ensure the jam reaches the proper temperature for gel formation (220°F).
- Allowing the jam jars to cool and set at room temperature before sealing will help avoid condensation inside the jars.
- This jam keeps well refrigerated for several weeks.
- Prep Time: 5 minutes
- Cook Time: 15 minutes
- Category: Jam
- Method: Stovetop
- Cuisine: American
- Diet: Vegetarian
