Old-school style beach plum jelly is made without any added pectin. When gathering them in the wild make sure to include some under-ripe berries. A long simmer makes for a good strong set. It's a sticky jelly with a good puckery punch.
Getting a good set for strawberry jam can be hard without extra pectin, lots of sugar, or a long cooking time. Enter the cranberry. Lots of natural pectin, beautiful ruby red color, and a little tartness make this the perfect strawberry jam.