Coarsely crush the blueberries in a 4-quart pot using a potato masher. Stir in the sugar. Bring mixture to a rolling boil, stirring constantly to dissolve the sugar. Stir in pectin and return to a boil. Boil for 1 more minutes, stirring constantly.
Remove from heat. Stir in the lemon juice and transfer jam to glass jelly jars. Cover and chill for at least 2 hours or as long as 1 month. Stir before serving.
cal. (kcal) 41,
carb. (g) 11,
Percent Daily Values are based on a 2,000 calorie diet