Sour cherries meet their soul mates, tart beach plums. The beach plum jelly base thinkens the cherry jam. The cherries are left whole for a delux presentation. Low sugar pectin keeps things from getting too tame. It's good.
Fresh sour cherries are somewhat rare as they don't travel as well as the sweet red and yellow versions. So when Lady Luck hands you a couple of pints do yourself a favor and put up this sweet and tangy low-sugar Sour Cherry jam.