So we made raisins! These were just organic red seedless grapes, not a dark variety so they look more like a golden raisin but when I tasted it I loved it! Different flavor but very fresh! Can easily be worked into baked goods or just eaten plain.
We blanched the grapes in boiling water for 30 seconds and dropped them into an ice bath, just to soften the skins. We lay them out to dry and patted them with a paper towel. You can use a very low oven or a dehydrator - my oven goes no lower than 170* so I opted for the dehydrator. Timing will vary - just keep watch over them. Ours took about 18-19 hours. I ran the dehydrator with herbs as well on other shelves so as to multi-task!
Once dry, they will feel slightly sticky but definitely dried, let them cool off and the keep them in a covered container in your pantry!