One of the most common things for me to dehydrate is tomatoes. It is so easy, and takes so little time. There is no pre-treatment necessary. You just slice the tomatoes and place them on the tray. My favorite tomatoes to dry are Juliet. They are a small, oval paste tomato. That means that they are meatier than slicing tomatoes, so they are good for sauces and pastes. Once dry, I can slip them into soups, stews, and chili. I can also put them in a coffee grinder or food processor and make them into a powder to thicken soups and sauces. They kids like to snack on them just as they are. Please note that they keep for a very long time if you store the dehydrated tomatoes in the freezer. A half a bushel fit into two 32 ounce plastic yogurt containers.
This year I dried some of our abundant okra harvest. It's even easier than tomatoes, since it dries very quickly. I will use it in soups and in fritters. It can only be stored in the freezer after it is dried. It doesn't last long if dried and kept at room temperature. Huge amounts of okra fit into the same size yogurt containers that I used for my tomatoes.
Hubby found dried green beans at the Amish store and wants me to try that. It will have to be next year. Our crop didn't last very long with the hot dry weather that we had early in the summer. I know that I've read account of pioneers stringing green beans and hanging them to dry. This would just speed up the process.
I'll never regret getting a dehydrator. As much as I like canning and have done LOTS of it over the years, I know that heat destroys some of the nutrients. Dehydrating does not.
Let me know if you use a dehydrator. I'd love to hear what you make with it.