I got an special request from Idiot/Savant the other day to post a recipe for semi-dried tomatoes. Luckily this is something I saw in the restaurants, and I know it’s easy as. It’s also extremely Frugal.
If you want a particular recipe shown in a step-by-step, just give me a yell and I’ll see what I can do. Within reason. Par-boiled yak might exceed by meagre skills…
In this case I used about 2ish kilos of tomatoes costing about $4, and 1kg of Rock Salt costing $1.50 (I used the rock salt twice, in two “shifts”). The real expense was probably running the oven for four or five hours. So all up we can assume this cost us about $6 or $7?
What I got from this was several hundred grams of semi-dried tomatoes. Considering that the “gourmet” tomatoes in the supermarket cost $7 for a smallish cryo-vac of 250g, this is a good deal.
Here’s what you’ll need.
- A kilo of Roma tomatoes. You can use any tomatoes, but Roma are the best because of their low acidity. They’ll end up sweeter and generally just, plain, extremely delicious.
- A matching weight of rock salt. This is generally pretty cheap.
- Fresh herbs, especially Thyme.
- A decent sized, sterilised jar to store them in.
- A large amount of oil, vegetable oil is ok, olive oil is best.
And that’s it. We’ve been tucking into these on bread, with cheese. But you can eat them in a myriad of dishes.
To start,turn your oven on to bake at about 100 degree Celsius. Do not use fan-forced. The idea is to dry these guys really slowly.
Spread your rock salt across the bottom of a large-ish oven tray (this one is 36cm by 25cm on the base). You want the salt to be fairly deep, at least a centimetre. That way the liquids from the tomatoes will run into the salt, be held, and not burn. Here I’m re-using salt from a previous batch (two is usually the limit), and topping up with some left over from last time.


Next, carefully wash any dirt or grit off your tomatoes. Then slice them into sizable bits. These I quartered, but Roma tend to be a little smaller, so you could probably just halve them.


As you cut the tomatoes place them in a bowl, and add some fresh thyme leaves. Mix very gently with your hands.


Once you’ve cut and ‘herbed’ the tomatoes, lay them out in the prepared tray. Don’t fret if they’re touching each other. Really pack them into the tray, but keep them a little away from the edges (which heat up, and can burn the fruit).




When the tray is full, drizzle with a small amount of olive oil, whack it into the oven, and leave for about 5 hours! Simple! Just make sure you check on the tray every hour or so to see progress.


As you can see to the right, the tomatoes are starting to become ‘slack’, and collapse a little.
Actually… this shot is probably a little too dark. But the idea is for the tomatoes to start to look like they’re roasted, but without darkening too much.
What you’re doing to preserving these tomatoes, which are abundant this time of year, by salting and drying them out. To keep them we’ll store them under oil, but doing it this way ensures that they don’t rot badly while they’re stored, while also sweetening them significantly.
You can compare the photo below with the shot of them entering the oven. They’re shrunk a lot, and in some cases are actually dried.

Once they’re cooked, place them in a large, sterile jar. To sterilise a jar and its lid, place them into a large pot of water, and boil it for at least minutes.
Don’t squash the tomatoes in, just let them fall into the jar. Fill to about half way with tomatoes, then stuff other fresh herbs like Pizza thyme, regular thyme, and rosemary into the sides. Then fill with tomatoes, and top the jar up with you chosen oil.
And… you’re done.

PS!! Once you’ve opened the jar – refrigerate.
4 January, 2009 at 11:21 pm
I’ve been using racks over a cookie tray, but that has problems with things burning. Rock salt sounds like a good idea. As does the olive oila nd thyme.
I’ve also been sterilising things by sticking them in the oven at 125 C for 10 minutes or so (recommended by The Destitute Gourmet, which is a book any frugal cook should like).
So, the herbs don’t screw up the sterilisation then?
5 January, 2009 at 6:32 am
if a little of the rock salt ends up in the oil, no worries. just flavours it a little more.
the herbs should be ok. the tomatoes themselves haven’t actually been sterilised… once the oil soaks into the fresh herbs they’re pretty well preserved enough to be keep in a cool, dark spot like the pantry.
5 January, 2009 at 7:52 am
Where do you find the rock salt so cheap, sir? Our regular pusher (Newtown New World) has reverted back to the little Cannamela dispensers, that have the same price per kilo as enriched uranium.
5 January, 2009 at 8:27 am
moore wilsons. but… don’t make too much of a rush on the place or they’ll amp up their prices.
they sell it in 1kg bags (and maybe larger, but that’s the size i’ve seen)
5 January, 2009 at 1:15 pm
One kilo will do nicely. Thanks.
5 January, 2009 at 6:49 pm
AND!! make sure you refrigerate the jar after you’ve opened it.
mine has a tiny bit of mould around the top already. the fridge will fix that though.
5 January, 2009 at 10:35 pm
When I used the fridge, my oil went cloudy (which tells me my fridge is set too cold).
7 January, 2009 at 9:49 am
When I used the fridge, my oil went cloudy (which tells me my fridge is set too cold).
Olive oil solidifies at (relatively) warm temperatures. I remember of a Dunedin winter seeing selves of bottles with little white bits in at the supermarket.
18 January, 2009 at 10:16 am
I thoroughly recommend eating them with this bread. http://steamykitchen.com/blog/2007/09/10/no-knead-bread-revisited/
I find that leaving it to rise for the longer period produces the nicest texture.
24 January, 2009 at 2:35 pm
re: the olive oil and winters in Dunedin: remember one year the oil on the shelf in our kitchen went solid. Not cloudy – talking consistency of lard. And the kitchen was just about the warmest room in the house…
Great recipe. I have a dehydrator so am using that rather than the oven/salt method.
7 April, 2009 at 8:09 pm
[...] Made semi-dried tomatoes as per Mr. Tibby’s instructions (head chefs never seem to have recipes, have you noticed? It’s always instructions…), [...]
18 February, 2010 at 12:46 pm
I must have done something wrong – after drying for about 10 hours in my dehydrator I put them in oil as suggested. One bottle was ok last week but this week’s bottle is totally rotten and the oil is bubbling up (fermenting tomatoes) – the next bottle is doing the same. Any suggestions???
18 February, 2010 at 7:52 pm
did you sterilise the jars as you would for preserves?
15 March, 2013 at 12:02 pm
The same thing happened to me using a dehydrator. Could it be that the tomatoes weren’t dried enough and that there was no added salt. I made 6 jars using different spices and one by one the oil is bubbling up.
30 January, 2011 at 1:55 pm
there might be air getting into the jar.
11 February, 2011 at 10:34 am
I have just finished my first batch it looks really great, we were burnt out in the fires in 2009, and this is the first thing I have wanted to grow and do, thankyou very much for the easy recipe, I didnt have any thyme so I use basil, rosemary and garlic hope it works out
9 December, 2011 at 5:43 pm
Tried this yesterday! Could not eat the tomatoes as they were like eating a teaspoonful of salt! What have I done wrong? I followed your instructions to the letter.
11 December, 2011 at 7:14 pm
hmmm… if you used anything other than rock salt it would have stuck to tomatoes.