Delicious and beautiful jam made from home-grown strawberries and blackberries! What I did was juice the blackberries to get all those pesky seeds out and used the whole strawberry giving it the texture and flavor of strawberry jam with a tart kick from the blackberries. I also used Pomona's Universal Pectin- it's the best! Basically you follow the guidelines of how much juice/fruit you have and you add tiny amounts of pectin to suit the jam. It allows you to decrease the amount of sugar added, leaving your jam tasting more like fruit instead of candy.