Forget the jarred ones, fresh grape leaves rock!
For Dolmas I blanch the grape leaves just til wilted in and out quick, put in ice water then sort by size and I will roll up 12 leaves in plastic wrap and freeze in these sized and portioned little rolls in a heavy pastic bag to use all year long as the young new leaves are the best, once they get thick and drier not good for cooking. These leaves work great when you need to wrap fish or other items for backing. I often lay them on a piece of backcing paper, add the fish or meat woth lots of thinkly sliced onions and lemons (if you have nastursium leaves instead of pepper add a few here as well), wrap and bake or BBQ. Ejoy the beginning of summer with this great garden green.