I saved the skins and seeds from making sauce to dehydrate to make powder. Why powder? Well, to add to soups or stews to give it a little tomato flavor, of course! You can also add it to spruce up your recipes without adding extra liquid.
I placed the skins and seeds on a roll-up tray in a thin layer.
After about 4 hours on high, I used a fork to lift and flip the mass of skins.
I let it dry another 4 hours. It probably didn't need that long, but I wanted to err on the side of caution.
The next morning, I put it into a quart canning jar and used the bottom of my blender to create it's own canister to grind it up into.
I had to keep shaking the jar to get it to grind, but it only took a couple of minutes to become a fine powder.
The kids were astonished as to how small the skins from over 100 tomatoes ground up into!