Fill a large stockpot half way with water and bring to a boil. Fill a large mixing bowl with ice water and set aside.
Using a sharp paring knife, cut a small X, an inch or two in length, in the bottom of each peach.
When the water comes to a boil, carefully drop in half of the peaches and allow to simmer for just a minute, or until the skin easily pulls away from the X cut in the bottom. Transfer to the ice water immediately and allow to cool for a few minutes before transferring to a large cutting board. Bring the water back to a boil and repeat with the remaining peaches.
Peel and pit the peaches (keep the skin and add to your smoothies!). Using your hand or a knife, roughly cut the peaches into 1/2 to 1 inch chunks. For ease, I simply pulled the peaches away from the pits over a bowl and used my fingers to break them up into rough pieces (you should have about 4 cups).
Mix with the remaining Peach Jam ingredients, taste, and adjust sugar, lemon juice and/or garam masala as desired (I added a touch more of all these ingredients but it will depend on the sweetness/flavor of your peaches).
Prepare the Pectin:
NOTE: these instructions are for Paloma's Universal Pectin only. Not all brands of pectin work the same.
Prepare the calcium water by adding 1/2 teaspoon calcium powder to 1/2 cup water and stir to combine.
Heat the water in the microwave in a 2 cup liquid measuring cup until boiling. Remove and pour in the pectin. Using an immersion blender, blend until fully incorporated and the liquid has thickened, about 1 minute (you could also use a blender if you don't have an immersion blender).
Make the Jam:
Pour the pectin into the jam and stir to combine. Add 4 teaspoons of calcium water and stir for 1-2 minutes, or until mixture is thick.
Transfer to 4 pint jars. Keep in the refrigerator for 2 weeks or freezer for up to 6 months.
I use Pomona's Universal Pectin brand because it is formulated to work with low sugar jams. If you are using a different brand, make sure to read the instructions carefully as you may need more sugar than my recipe indicates.