Purple combo: Eldergrape!

I've made plain elderberry jelly and plain grape jelly. I thought to myself, "they are both purple--why not combine them into Eldergrape Jelly?" I had some frozen Concord grapes, some still-fresh-after-two-months-in-the-fridge grapes and a pint of frozen extra grape juice. And gallons of frozen elderberries! The combo turned out delicious! Good thing, because now I have 15 pints of that combo jelly! Any friends and neighbors want to try it? Just let me know. :)