Ingredients
Units
Scale
- 2 cups fresh or frozen blueberries
- 3/4 cup granulated sugar
- 1 Tbsp fresh lemon juice
- 1 Tbsp rum
Instructions
- Place berries, sugar, lemon juice, and rum into a medium saucepan.
- Cook over medium-high heat and allow the mixture to come to a boil.
- Immediately reduce the heat to medium. Cook for 10 minutes. Smash some of the berries with a potato masher about halfway through the cooking time.
- The liquid in the saucepan should start to thicken. Test the mixture if desired with a thermometer to see if it has reached 220 degrees F/104 C.
- Ladle the jam into clean pint-sized mason jars and let cool. Then, seal jars and store them in the refrigerator. Eat within 2 weeks.