Kalyn's Kitchen

How to Make Slow Roasted Tomatoes

This post will show you How to Make Slow Roasted Tomatoes, which I think are one of the best things about summer! And be sure to check out the recipe ideas using slow roasted tomatoes linked below! 

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How to Make Slow Roasted Tomatoes found on KalynsKitchen.com

If you have a garden, or even access to a farmer’s market where you can get good fresh tomatoes, and you haven’t tried making slow roasted tomatoes, you’ve missed an absolute treat. I first learned about slow roasted tomatoes last year when I was just starting to read food blogs.

Suddenly it seemed like everyone was making roasted tomatoes, from Cookiecrumb, to Stephen, to Alanna, who tried lots of variations and posted the master recipe for slow roasted tomatoes which I (mostly) followed here. For years I had made tomato sauce from the tomatoes in my garden and frozen it to use all winter in soups, stews, and pasta sauce. But I hadn’t ever made roasted tomatoes.

Here’s what I did to get those lovely looking roasted tomatoes you see in the photo above, which I’m going to be turning into pasta salad with roasted tomatoes on Thursday, when some very special guests are coming for dinner.  I usually make several trays of these at a time, because they do require a long time in the oven, but I’m giving the base recipe that uses 20 tomatoes, enjoy! And here’s a nice tribute to the slow roasted tomatoes. Use Tomato Recipes to find more recipes like this one.

How to Make Slow Roasted Tomatoes found on KalynsKitchen.com

If possible, use a Roma type tomato for best flavor. You need about 20 tomatoes to fill a cookie sheet . Cut the tomatoes in half, leaving the stem piece whole. I tossed the tomatoes with olive oil, ground fennel, dried basil, dried oregano, and dried marjoram. I sprayed the cookie sheet with an olive oil mister, then arranged the tomatoes cut-side down on the cookie sheet. I had pre-heated the oven to 250F. (see recipe notes.) After 3 hours, the skins of the tomatoes are just starting to wrinkle up a bit, and the house is starting to smell tomatoey.

How to Make Slow Roasted Tomatoes found on KalynsKitchen.com

After six hours, the tomatoes are considerably more shriveled looking. After two more hours, the smaller tomatoes are done. I took the tomatoes out, let them cool a bit, and pinched off the skins. Most of the skins came off easily. Leave the water running to rinse your hands. I turned the larger tomatoes over and put them back in the oven for one more hour. This round bowl 5 1/2 inches across and 2 1/2 inches high is how many tomatoes I got (minus a few that I ate!) The tomatoes taste like a month of summer experienced in one day.

How to Make Slow Roasted Tomatoes found on KalynsKitchen.com

The roasted tomatoes would be delicious chopped, tossed with freshly cooked pasta with a bit of olive oil, some fresh basil, and some freshly grated parmesan cheese. Last year I didn’t make nearly enough roasted tomatoes and ran out long before winter was over! But below are a few of the recipes I’ve used them in.

Recipes Using Slow Roasted Tomatoes:

Leftover Roast Beef Italian Stew
Slow Roasted Tomato Hummus
Italian Sausage and Zucchini Soup
Roasted Italian Sausage Soup with Garbanzos, Lentils, and Tomatoes
Roasted Tomato Soup with Ground Beef, Sausage, Garbanzos, Macaroni, and Basil
White Bean and Roasted Red Pepper Salad with Roasted Tomato-Basil Dressing
Roasted Tomato, Basil, and Goat Cheese Holiday Spread

How to Make Slow Roasted Tomatoes

These slow roasted tomatoes are one of the best things about summer!


  • 20 Roma type tomatoes (same size tomatoes are best if your garden cooperates)
  • 2 T olive oil, plus a little to oil the pan if you don’t have a mister
  • 1 T ground fennel
  • 2 T dried basil
  • 1 T dried oregano
  • 1 T dried majoram
  • Any combination of herbs that appeals to you can be used.


  1. Preheat oven to 250F (about 9 hours roasting time) or 200F (10-11 hours roasting time.)
  2. I used the shorter time, but mainly because my antique oven will not stay at 200F.
  3. Wash tomatoes, dry, and cut each tomato in half lengthwise, keeping the stem spot in one piece (to grab when peeling the tomatoes later.)
  4. Put tomatoes in a bowl and toss with olive oil and herbs.
  5. Spray cookie sheet with olive oil mister (or brush very lightly with oil).
  6. Arrange tomatoes cut-side down on cookie sheet.After about 8 hours, start checking tomatoes.
  7. They’re done when skins puff up and tomatoes are reduced in size by at least half.
  8. It’s a personal preference as to how dried you like them, and I prefer to cook mine until they look fairly dense, but still a tiny bit juicy.
  9. As tomatoes seem done, remove them from the pan. (Some will take longer than others.)
  10. Let them cool for a few minutes, then remove the skin by grabbing at the stem end and pulling off.
  11. Most of the skins come off easily. (Removing the skin is optional, but I always remove it.)
  12. These tomatoes have an intense tomato flavor that you probably can’t get any other way.
  13. They can be eaten hot or cold.
  14. They freeze wonderfully to use all winter in soups, stews, and pasta sauces.


This recipe slightly adapted from Alanna’s master recipe for Slow Roasted Tomatoes.

All images and text ©

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
One medium tomato has about five carbs and quite a bit of that is sugar, so the carbs could add up if you’re using these slow roasted tomatoes in a recipe. I would use them sparingly with other low-carb ingredients if you’re following the South Beach Diet or another low-carb eating plan.

Find More Recipes Like This One:
Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

Nutritional Information?
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    90 Comments on “How to Make Slow Roasted Tomatoes”

  1. No, I do not give permission for this post to be reproduced on another blog. I would consider such "cloning" to be copyright violation.

  2. Can I clone your article to my blog? Thank you…

  3. Brandon, regular tomatoes have a higher water content than the roma tomatoes I used, so I'm guessing your cooking time will be longer. I would watch them carefully the last few hours and take out each tomato as it's done.

  4. Hello I am planning on doing this using some perfectly ripened purple heirloom tomatoes and probably about half the quantity the recipe calls for (about 6-7 tomatoes each almost twice the size of your average Roma) any pointers or ideas as far as adjustments in time or temperature?

    Thanks alot


  5. You can roast the cherry and grape tomatoes to bump up their flavor, but they don't get that slow roasted carmelization that the larger tomatoes do because you'll have to cook them for a much shorter time. I'd say it's most worth the time to do this when you have vine-ripened roma tomatoes in the summer, but if you want to try it with the tomatoes you have now they'll still be tasty.

  6. Hi, Kalyn. Would this work for cherry & grape tomatoes, which are the tastiest and most affordable tomatoes to me just now, or should I wait for summertime fresh ones? Thanks, Jen H.

  7. Gia, glad you're enjoying the slow roasted tomatoes, and welcome.

  8. Those are perfect roasted tomatoes. This is great with Kebab and rice. 🙂 I always have difficulties peeling the skin, thanks for your post, now I can do it easily. This is my first visit to your lovely blog and I'm loving it. ~ Gia

  9. Salsa, oh yes!! That would be really good!

  10. Val, thanks for sharing your experiment trying it with green tomatoes. They might be good in salsa?

  11. Hi all,

    OK, I tried the slow roasted green tomatoes. They don't taste bad, just very different from red.

    1) skin comes off not as easily
    2) really tastes like a fried green tomato
    3) taste is not as robust as red.

    I have mixed the red and green together in cooking and it helps the volume without ruining the taste.

  12. Valerie, I've never tried it or heard of anyone doing it. I usually wrap my green tomatoes in newspaper and let them ripen in the house. You could do that and then roast them.

    If you try roasting green one, please let us know how they taste!

  13. Kalyn,

    Can you slow roast green tomatoes (not ripe), have you ever tried this?

  14. Anonymous, sorry to hear that. The idea of this recipe is to cook them for a long time at low heat, so a pizza stone would work against that. Hope the ones on the cookie sheet are okay.

  15. I just cooked two batches all day – one on a cookie sheet and the others on my Pamper Chef Stone – the stones were done first and I lost the whole batch as they are burned – nohing left. Very disappointing. To boot, I just left a bag full of my last crop of tomoatoes for the neighbors – I just hope that I get another batch before the end of the season.

  16. Jamie, I'm sure you can layer pans in the oven. I'm guessing they'd take a little longer, but I haven't done it so I don't know how much. (I would rotate the pans a couple of times too.)

  17. Hi Kalyn, I just bought a bunch of organic Plum tomatoes to roast and have a question… can I layer pans in the oven to get more done at once? If so, what adjustments should I make? Thanks and I am excited to throw these in the oven in the a.m.

  18. CC, about half of them were done after 6 hours; the others are finishing up now!

  19. Michelle, I love the idea of golden romas being roasted. I bet they will be absolutely wonderful. And so pretty to make a dish with red and yellow ones combined!