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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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.
Starting the process for Slow Roasted Tomatoes:
(Scroll down for complete recipe with nutritional information. Warning: these concentrated tomatoes are quite high in carbs. But luckily it doesn’t take many to add intense tomato flavor.)
- 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.
Finishing the Slow Roasted Tomatoes:
- 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 use the Slow Roasted Tomatoes:
- You can use slow roasted tomatoes (in a smaller amount) in any soup or stew recipe where you’d use canned roasted tomatoes.
- 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.
- Slow Roasted tomatoes would be an amazing ingredient to add to pasta salad or marinated vegetable salad.
- The slow roasted tomatoes were great in Roasted Tomato Hummus.
Last year I didn’t make nearly enough roasted tomatoes and ran out long before winter was over! And if you’re going to use the oven this long to make roasted tomatoes I recommend making as many as you can fit in the oven!
Slow Roasted Tomatoes
I think Slow Roasted Tomatoes are one of the best things about summer! The long cooking time at a low temperature concentrates the tomato flavor in a remarkable way.
- 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.
- Preheat oven to 250 F (about 9 hours roasting time) or 200 F (10-11 hours roasting time.) I used the shorter time, but mainly because my antique oven will not stay at 200 F.
- Wash tomatoes, dry, and cut each tomato in half lengthwise, keeping the stem spot in one piece (to grab when peeling the tomatoes later.)
- Put tomatoes in a bowl and toss with olive oil and herbs.
- Spray cookie sheet with olive oil mister (or brush very lightly with oil).
- Arrange tomatoes cut-side down on cookie sheet.
- After about 8 hours, start checking tomatoes. They're done when skins puff up and tomatoes are reduced in size by at least half. 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.
- These tomatoes have an intense tomato flavor that you probably can't get any other way. They can be eaten hot or cold. They freeze wonderfully to use all winter in soups, stews, and pasta sauces.
I definitely made these Slow Roasted Tomatoes before people became more energy conscious, and you may not want to turn on the oven for such a long time these days. I haven't tried roasting the tomatoes at a higher temperature or in the Air Fryer for a shorter time, but I think it would be worth trying.
I am considering two tomatoes to be a serving for nutritional information for this recipe, because these Slow Roasted Tomatoes are mostly used in small amounts to flavor a recipe.
Amount Per Serving: Calories: 84Total Fat: 5gSaturated Fat: 1gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 0mgSodium: 14mgCarbohydrates: 10gFiber: 3gSugar: 7gProtein: 2g
Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations.
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 Cooking for Gardeners to find more recipes like this one. Use the 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, on Facebook, on Instagram, on TikTok, or on YouTube to see all the good recipes I’m sharing there.
Historical Notes for this Recipe:
This recipe was post in 2006, in the early days of my blog when food bloggers would find and try recipes from other bloggers, and when passionate cooks didn’t think twice about using the oven all day long to make wonderful-tasting slow roasted tomatoes! The recipe was last updated with more information in 2022.
92 Comments on “How to Make Slow Roasted Tomatoes”
I would love to try this recipe but my husband doesn’t like the oven going for that long in summer. I roasted with onions, olive oil, spice for 20-25 MI uses in oven 400 degrees. Let it cool. Run thru blender then freeze. So goid in winter. Love your recipes. Great low carb recipes.
Yes, this is an old recipe and I’m not sure I’d use the oven that long now either. I’ve been thinking of trying it in the Air Fryer. Your method sounds good too. Glad you are enjoying the recipes!
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Annabella, sorry to hear that. I would use a meatier Roma type tomato for this. I've never made them without watching as they cook; I do recommend that.
Do you think you can do some or all the cooking in the microwave and thus reduce the total number of hours in the oven? If yes, how many hours would it be in the microwave? Looks like a wonderful recipe!
I'm really not sure how microwaving them for part of the time would work, but I'm guessing it would not give the same result because what makes these so good is the way the long cooking time in the oven cooks out the moisture and concentrates the flavor. Love to hear how it works if you try it though!
Followed directions exactly, mine burned. I used Celebrity variety tomatoes (another canning variety.) Same oven settings, but woke to the smell of burned tomatoey sugar at 6.5 hours. Smaller (Roma sized toms) had nothing left to try, but the larger ones left a small amount between the char to taste test. I nearly ruined my late grandmother's baking pans 🙁 If I try again I will roast at a time I can check them regularly, and I will begin looking for roasting pans at yard sales to use just in case.
You're so welcome, so glad you've enjoyed them.
Just picked up a case of roma tomatos from the farmer's market to have these goodies for the winter/spring. This is my 2nd year doing it and just wanted to thank you for the how-to and inspiration!
Elizabeth, the roasted tomatoes really are so delicious and useful in lots of recipes.
I never thought of adding herbs to slow roasted tomatoes! Wait a minute! I've never thought of slow roasting tomatoes (except to really slow roast them in a very very low oven to dry them)
I bet these are fantastic! I'll be keeping my eyes open for baskets of plum tomatoes at the market now.
Looks great but too much time in the oven for me.