We like using this jam for pork and venison roasts. It's also really nice on ice cream. Red currants are tart, so they need some help to sweeten them up. The blood orange and raspberries add some sweet while marrying well with tart.
Lemons are among the most productive fruit trees, and many can bear fruit for nearly half the year. One tree can produce far more lemons than a family can readily use. That is, unless you make an effort to utilize all this sour fruit has to offer.