Fresh Blueberry Jam

We have been getting blueberries from South Moon Farm (a Florida farm) for the past few weeks. Now that the cooking berries ($4/pound) are available I decided to make some jam. I used about 4 pounds of blueberries to make this recipe and I did not use the Certo Fruit Pectin.

1 1/2 qt. fresh blueberries, crush to equal 4 1/2 c.
2 tbsp. lemon juice
7 c. sugar
2 pouches Certo fruit pectin
1 tsp. butter
12 (8 oz.) or 20 (4 oz.) jars with lids, sterilized


Prepare 8 oz. jam jars by boiling them for 10 minutes. Prepare fruit in large 5-quart pan on stove. Stir sugar into fruit. Mix well and add 1 teaspoon butter. Bring mix to full boil for 5 minutes over high heat; stir constantly.

Pour Certo (2 pouches) into fruit and continue to boil for 1 minute, stirring constantly. Remove from heat and skim off foam. Ladle into jars, wipe rims of jam. Turn jars upside down for 5 minutes and then turn upright. Let set for 1 hour.

From: http://www.blueberry-recipe.com/fresh-blueberry-jam.html