1cupberriesraspberries, blueberries, blackberries, or a mix rinsed
Put the berries in a large glass bowl. If you are using blackberries and they are large, cut them in half. Toss the berries with the cornstarch.
Cover the bowl with a dinner plate, and microwave for 3 minutes. Give it a stir. If your jam is still very runny, pop it back into the microwave for 30 second intervals. Be careful, it will get quite hot.
Spoon the jam into a clean jar and let cool Store in the refrigerator, the jam will firm up as it cools.
You can also use the hot jam, right out of the microwave, as a dessert sauce over cake or ice cream.
https://theviewfromgreatisland.com/3-minute-sugar-free-microwave-jam/ May 18, 2014