Small batch mixed berry and grape jam

We buy fresh fruit every week, mainly for breakfast and afternoon snacks. We ended up having 1 lb strawberries, 1/2 cup blueberries, and 1 cup black seedless grapes leftover, so we decided to try this recipe: https://kickassbaker.com/mixed-berry-jam/

Our modifications: first, we reduced sugar to 1/4 cup. Second, we found the jam was ready in about 25-30 mins (not 40). Finally, we used clean Mason jars but did not follow the canning process. We are storing this as a fridge jam instead: https://www.forksoverknives.com/how-tos/how-to-make-quick-homemade-jam-no-canning-needed/ (May 2024)