“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.
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.