I have made them outside (very hot in AZ).
You get some new window screen from home depot.
Lay the tomatoes on a vented sheet (I have a couple pizza pans that work really well, one is like just mesh, the other is like a big round cookie sheet but full of holes). Top with the screen. I pop them on a chaise lounge or somewhere elevated, not right on the ground. Direct sun. Sometimes I turn them over one by one, if it’s not that hot, that seems to speed them up – but I often do this with cherry tomatoes and it can take a long time so sometimes I just leave them until they’re dry. Never had a bug get to them, and they keep forever. No mold and they taste great even a few years later. I don’t know if this work work as well in a humid area though.
The tomatoes themselves are a little acidic so I think that helps keep any cooties from sprouting.
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