Celebrate the cherry season with this Sour Cherry Jam made without pectin. Use it as a cake filling, spread it on toast, swirl it into Greek yogurt or offer it as a lovely gift to your friends and family! As the name implies it, sour cherries aren’t as sweet as other types of cherries which is why they are often referred to as tart cherries. For some, they are too tart to be eaten on their own, but with a bit of sugar and love, they become magically delicious!