Have you ever used a dehydrator? I have one that I've used for 30 years. It's just a counter top model made by Mr. Coffee and doesn't have an adjustable thermostat, but over the years I've made fruit leathers, jerky and recently I've been using it to dry excess fruit.
The last of the washed green grapes were starting to turn in the fridge so I hauled out the dehydrator. After cutting the grapes in half and waiting patiently for 8 hours, I had this bowl of golden raisens.
Oh what a lovely additon this will make to the morning oatmeal.