Drying Tomatoes Without an Oven

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Drying tomatoes on a platter
Photo by Holly A. Heyser

“Oh my Gawd, it’s like an oven out here!” This is a not-uncommon refrain heard in Sacramento in summer. Well, if life gives you an oven, use it.

This is one of the few places in the country where I can consistently dry things without an oven: Sacramento typically sees summer days over 95 degrees and humidity levels below 60 percent, sometimes way below 60 percent. Perfect for drying.

Tomatoes, as anyone knows, have lots of water. Even the paste or processing tomatoes I use do. Forget about beefsteaks and most heirlooms, which, while tasty, have even more water in them than most maters. Getting 85 to 90 percent of that water out, which is what you need to properly preserve tomatoes (or anything, really) without cooking the tomato is tricky.

Most recipes ask you to put the slices into a warm oven, but even a warm oven will be close to 175°F. Yes, you can put the oven on its lowest setting, keep it ajar and use a fan to blow air into it, but that is an awful lot of work. Once you get past 130°F or so, you are cooking the tomato, and this irrevocably changes the flavor. You will also begin to lose vitamins.

A commercial dehydrator is another option, and it works great, especially if you live somewhere humid.

Here I have is the perfect natural dehydrator for drying tomatoes: My garage.

But Hank, these are not SUN dried tomatoes, then? No. No, they’re not. They’re better. Quick quiz: What does the sun do to colors? Time’s up. It bleaches them. Even the powerful color of a tomato often will be bleached in the time it takes to dry it. The much-darker garage prevents that color loss and leaves me with those pretty tomatoes you see above.

Getting this right isn’t as easy as skewering some tomatoes and hanging them haphazardly. I tried that, and was rewarded with a thriving colony of black mold. Big fail. Out $6 worth of tomatoes, I tried again. This time I added salt. Not good enough. I lost 80 percent of them to black mold.

This is the trade-off I am making for better tomatoes. I could put them in the sun — or inside my truck, where it is even hotter — but then I run the risk of losing color and flavor. No mold issue, but an inferior dried tomato. Doing it in the garage takes 2 to 4 days, enough time for mold to grow.

Drying tomatoes on a plate
Photo by Holly A. Heyser

The answer? Red wine vinegar. I tried a third batch with a little vinegar, and lost only one tomato to mold. Here’s how I did it:

  • I sliced paste tomatoes (big Romas) lengthwise into pieces about 1/4 inch wide.
  • I sprinkled salt down on cookie sheets and poured some red wine vinegar into a bowl.
  • Each tomato slice got a quick bath in the vinegar — only a second or two — and then was placed on the salted cookie sheet. When each sheet filled up, I sprinkled more salt on top.
  • I skewered the tomato slices and hung them to dry in the garage. Why skewers? Because you then have as little contact with a hard surface as possible, and everything that touches a hard surface can trap moisture and promote mold growth. Do not let the tomatoes touch each other when hanging.
  • Check them every day. You can take them down when the tomatoes are dry but leathery — this is how I like them — or when fully crispy.

The leathery tomatoes are perfect preserved underneath olive oil. They are a good antipasto all by themselves. The crispy ones can be tossed into soups or even powdered; powdered tomato makes a cool addition to a pasta dough.

Is there another method for drying tomatoes? You bet. In fact, I just learned a new one in, of all things, a book that focuses on grilled meat. I received a review copy of Peter Kaminsky and Francis Mallmann’s Seven Fires: Grilling the Argentine Way, and while perusing it I noticed an unusual method for drying tomatoes: Slicing them very thin and drying them on Silpats, which you bakers know as the ultimate non-stick mat.

This method requires neither vinegar nor salt, although I like a little salt tossed on for flavor. You do need a Silpat — otherwise good luck getting the dried slice off your cookie sheet — and a very sharp knife.

I sliced a few Romas about 1/16th of an inch thick and set them down on the Silpat and put that in the garage. Within 36 hours they were somewhere between the leathery and crispy stage. I tasted one: Chewy, oddly light yet meaty, with a blast of tomato flavor at the end. It was tomato ‘salami.’

I like this method so much I plan on putting up many jars of this ‘salami,’ preserved in olive oil like their regular dried cousins.

I can dry my own tomatoes with the best of them, and I make a good base tomato sauce that I put up for the winter. I make tomato paste the Sicilian way; they call it estrattu. I’m also messing around with some very old recipes I’ve found in a fascinating book called Preserving Food without Freezing or Canning. I’ll be back when I test them out. Be warned: Some are pretty freaky.

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About Hank Shaw

Hey there. Welcome to Hunter Angler Gardener Cook, the internet’s largest source of recipes and know-how for wild foods. I am a chef, author, and yes, hunter, angler, gardener, forager and cook. Follow me on Instagram and on Facebook.

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29 Comments

  1. I put quartered Roma tomatoes on a jerky dehydrator try (stackable wire rack) and then placed that on my wood stove. I did dry what I thought was a large batch, (they reduced down to about half a pint). I covered in olive oil, heated it all in the oven at 200 then put the lid on to cool. Mostly an experiment, but they have been in the fridge for 2 months now and seem to be fine. I like to put them in tomato soup. I suppose I did change the flavors from the heat, but I don’t have those hot summers in North Dakota. The few I sampled before canning tasted great.
    I always hate buying anything I can make myself. Thanks for all the excellent information.

  2. I’m drying a pound of san marzano’s in a dehydrator. Overnight they developed some white mold on a some. I guess they will be alright when they are completely dried.

  3. Hank,
    Using your outstanding information and a method borrowed from Alton Brown of the Food Network, I dried my first harvest. Living in SW Arizona the temperatures get very warm which helped with the method but isn’t necessary. In only 48 hours I had beautifully dried tomatoes with no mold issues in a small space.

    Per Alton, use a 20″ square box fan, 20″ square non-fiberglass pleated AC/furnace filters, non-stick dehydrator mesh mats, and 2 bungee cords. Prepare tomatoes as you describe. Stack a filter, dryer mesh, tomatoes, dryer mesh, and filter. Repeat until you finish with a filter. Bungee to box fan and lay flat on it’s back on a suitable elevated surface like a milk crate or some cinder blocks. Set fan to medium speed and forget it for two days. Cooler areas may require high speed as it is the air passage and not the heat that dehydrates.

    I’m glad I stumbled onto your site. It has a lot of information I’ll be using in the future.

  4. I’ve been making that weird recipe from the preserving book. It’s an old recipe from Provence that require the tomatoes to ferment, dry and then get rolled into little balls and stuck in oil. THEY’RE GREAT! Tomato candy.

    The odd byproduct that I’ve grown to love (and acquired taste for sure) is the fermented tomato water that released as the tomatoes ferment in the sun. It’s a sweet, bubbly (and possibly very-slightly alcoholic) elixir. Everyone in my family looks at me cross-eyed, but it’s delish.

    A great recipe to try when the farmers (or you) have an abundance of ugly over-ripes. They give them to me for free—no tomato is too ripe for the recipe.

    Try it if you have some over-the-edge tomatoes.

  5. Wendy: Hmmm…darks and crisp, huh? Sounds like you let them dry waaay too much. My suggestion at this point is to grind them to a powder in a spice mill and use the tomatoes that way. I like to use tomato powder in pasta — turns it red!

  6. HELP. I have been so excited about drying tomatoes from the huge harvest in my garden but I think I have overdried them all. I have done some grape tomatoes and then yesterday two pans of romas, all dried in the oven. They are dark and crisp. Please tell me I can still use them. I am going to try again, watching much more closely for doneness. Suggestions?

  7. Nice job….
    I agree about keeping foods out of the sun. I’ve been doing some low tech cookie sheet drying in the sun, one sheet over the other with a small gap top and bottom to flow air. I was able to dry sliced cactus in 48 hours.
    I’ll be making a link from my blog to your site… useful information!

  8. The Tin shed was a great idea for me. I did about 4 pounds or so of Romas and it took about 7 hours! They taste fabulous. Thanks for all your help with this process.