Jam

1 1/2 quarts fresh berries
1 cup unsweetened fruit juice concentrate
pectin powder
3/4 tsp. powdered stevia extract

Wash, rinse, and sterilize jars.
Clean berries, remove hulls, and mash. One and one half quarts of fresh berries will be 3 cups mashed. Place in a suace pan.
Add 4 tsp calcium water to the berries and stir well.
In another small sauce pan bring the juice concentrate to a boil. Place in a blender. Add 2 tsp of pectin powder and blend 1 - 2 minutes until powder is dissolved.
Bring fruit to a boil. Add the dissolved pectin. Stir vigorously 1 minute. Stir in the stevia extract. Bring back to a boil and remove from heat.
Fill jars to 1/2 inch from the top. Screw on 2 piece lids. Boil 5 minutes. Remove from water and let jars cool. Lids should pop to be sealed.

Extracted from here