Prepare your jars - wash and dry them. One batch makes 3 - 8 oz jars of jam.
Wash and rinse the strawberries and rhubarb and cut themup into chunks
Make the calcium water - mix 1 teaspoon of calcium powder with 1/2 cup of water. This will be the calcium water that you use 1 TBS of for this recipe. You can reserve the rest of the calcium powder to make more batches of this jam.
Blend the cut-up strawberries, rhubarb, lemon juice, and calcium water in a blender and mix thoroughly. Add the berry puree into a pan on the stove, and bring to a boil for 2 minutes.
In a separate bowl, add the sugar and 1 Tbsp of pectin and mix thoroughly, stirring constantly. After the berry mixture has boiled for 2 minutes on the stove, add the sugar mixture and bring to a boil for 5 minutes.
Remove the jam from the heat. Fill your jars up to 1/4 in to the top. Allow the jam to cool down to room temperature. Once they have cooled, you can put them in the freezer!