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Roasted Tomato Sauce is what happens when you let the oven do the cooking, six pounds of fresh tomatoes blacken and caramelize with garlic, onion, and balsamic until they practically collapse into sauce, and it is my favorite way to handle the late summer tomato pile taking over the counter. When the pantry is bare and there are no fresh tomatoes in sight, our homemade pasta sauce covers the canned side of the equation.
Roast, blend, simmer, done, and the whole house smells incredible for hours.
Roasted Tomato Sauce Quick Look
- 🕒 Prep Time: 15 minutes
- 🌡️ Cook Time: 2 hours
- ⏳ Total Time: 2 hours 15 minutes
- 🍽️ Serving: 12 servings
- ⚡ Calories: 108kcal
- 🌶️ Flavor Profile: Deep roasted tomato with sweet garlic and a balsamic edge
- ✋ Difficulty: Easy hands off cooking, simpler than our homemade marinara sauce
Quick Answer
Preheat the oven to 425 degrees Fahrenheit. Toss 6 pounds of diced tomatoes in a large roasting pan with diced onion, a whole head of peeled garlic cloves, olive oil, balsamic vinegar, fresh oregano sprigs, salt, and pepper. Roast for 30 minutes, stir well, and roast another 30 minutes until blackened in spots. Blend everything smooth in a Dutch oven with an immersion blender, simmer uncovered 45 to 60 minutes to thicken, then stir in chopped fresh basil.
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Why This Recipe Works
Click to see the technique science
- Roasting concentrates the tomatoes. An hour at 425 drives off water and caramelizes the natural sugars, so the sauce tastes rich instead of watery, no tomato paste needed.
- The blackened spots are flavor. Those charred edges bring a subtle smoky depth that stovetop sauces simply cannot reach.
- A whole head of garlic mellows in the oven. Roasted garlic turns sweet and nutty, seasoning the whole batch without any raw bite.
- Balsamic plays up the sweetness. The vinegar reduces in the pan, adding a sweet tangy backbone that makes the tomatoes taste more like themselves.
- Blending skins and all keeps the good stuff. The roasted skins carry tons of flavor and color, and the immersion blender makes them disappear into a silky sauce.
- The final simmer sets the texture. Cooking the blended sauce down uncovered lets you stop exactly at the thickness you like.
Why You’ll Love This Recipe
- The oven does 90 percent of the work, you mostly just stir once.
- It is the best possible answer to a garden overflowing with ripe tomatoes.
- It out flavors our beloved marinara sauce when fresh tomatoes are in season.
Key Ingredients
Fresh from the garden or the produce aisle, these few ingredients carry the whole sauce.
- Tomatoes: Six pounds of ripe tomatoes, any variety works. Roma and vine ripened are extra meaty, and a mix is great.
- Garlic: A whole head, skins removed. Roasting mellows it into sweet, nutty depth.
- Yellow onion: Roasts alongside the tomatoes and blends into the sauce for body and sweetness.
- Balsamic vinegar: A quarter cup concentrates in the oven and deepens the roasted flavor.
- Fresh oregano and basil: Oregano roasts with the vegetables, basil stirs in fresh at the end for a bright finish.
See recipe card for exact quantities.
Variations and Substitutions
Once you have the roasting method down, riff away.
- Add a pinch of red pepper flakes before roasting for a spicy arrabbiata style sauce.
- Stir in a splash of heavy cream after blending for a silky tomato cream sauce.
- Roast a red bell pepper with the tomatoes for extra sweetness.
- Keep it chunky by pulsing instead of fully blending, perfect for topping our homemade potato gnocchi.
How to Make Roasted Tomato Sauce
- Preheat the oven to 425 degrees Fahrenheit.
- Add the diced tomatoes, onion, garlic cloves, olive oil, balsamic vinegar, oregano sprigs, salt, and pepper to a large roasting pan.
- Toss everything together well to coat.
- Roast for 30 minutes, stir well, then roast another 30 minutes until the top is blackened in some places.
- Pour everything into a Dutch oven and blend with an immersion blender until smooth.
- Simmer uncovered for 45 to 60 minutes, stirring occasionally, until the sauce reaches your preferred thickness.
- Stir in the chopped fresh basil and serve.
Recipe Tips & Tricks
- Use the ripest tomatoes you have. This recipe was built for peak season fruit, even slightly overripe tomatoes shine here.
- Do not fear the black spots. Charred edges on the tomatoes and onion are exactly what you want, that is roasted flavor.
- Keep the garlic cloves whole. They roast gently inside the tomato juices instead of burning.
- Use your biggest roasting pan. A crowded deep pan steams, a wide shallow one roasts.
- Blend right in the Dutch oven. An immersion blender saves you from ladling molten sauce into a countertop blender.
- Simmer to your preference. 45 minutes gives a pourable sauce, a full hour makes it thick enough for pizza.
Serving Ideas and Suggestions
Toss this roasted tomato sauce with spaghetti and fresh basil for the simplest perfect dinner, or ladle it over a batch of our homemade Italian meatballs.
It behaves like any great red sauce, layer it into lasagna, spoon it over chicken parmesan, or use it as the base for a from scratch pizza night with our homemade pizza sauce as the quick alternative.
For the full Italian rotation, keep our spaghetti aglio e olio and pasta amatriciana in the lineup for the nights this batch runs out.
This recipe makes about 6 cups. Refrigerate it in airtight containers for up to 5 days, or freeze it flat in zip top bags for up to 6 months, which is the real magic, a freezer full of summer tomatoes in the middle of January.
Roasted Tomato Sauce FAQs
No, and that is the beauty of this method. The skins roast, caramelize, and then blend completely smooth with an immersion blender. They add flavor, color, and body, and skipping the peeling step saves a solid half hour of work.
Any ripe tomato works. Roma and San Marzano types are meatier so the sauce thickens faster, vine ripened and beefsteak bring more juice and sweetness, and cherry tomatoes roast into little flavor bombs. A mixed batch from the garden is honestly ideal.
Five days in the refrigerator in an airtight container, or up to 6 months in the freezer. Freeze it flat in zip top bags for quick thawing, a bag thaws in a bowl of warm water in about 15 minutes for a true weeknight dinner save.
This recipe is written for refrigerating and freezing, not shelf stable canning. Roasted sauces with olive oil and fresh onion need pressure canning under tested guidelines to be safe, so if you want jars for the pantry, follow a tested canning recipe instead.
Juicier tomato varieties release a lot of liquid, the fix is simply more simmer time. Keep the sauce bubbling gently uncovered and it will reduce and concentrate, stir now and then so the bottom does not stick. The wide pan roast plus a full hour simmer usually lands perfectly thick.
Yes, they are fantastic. Leave them whole, keep everything else the same, and start checking at 45 minutes of roasting since they collapse faster than large tomatoes. The sauce comes out extra sweet and jammy.
Made this Roasted Tomato Sauce? I would love to hear how it turned out, leave a comment and a star rating below!
Roasted Tomato Sauce
Ingredients
- 6 pounds tomatoes stems removed, large dice
- 1 small yellow onions large dice
- 1 head garlic skins removed
- 1/3 cup olive oil
- 1/4 cup balsamic vinegar
- 20 sprigs fresh oregano
- 1 teaspoon kosher salt
- 1 teaspoon black pepper
- 12 large fresh basil leaves chopped
Instructions
- Preheat the oven to 425°F.
- Add the diced tomatoes, onion, garlic, olive oil, vinegar, oregano, salt, and pepper in a large roasting pan.6 pounds tomatoes, 1 small yellow onions, 1 head garlic, 1/3 cup olive oil, 1/4 cup balsamic vinegar, 20 sprigs fresh oregano, 1 teaspoon kosher salt, 1 teaspoon black pepper
- Toss well to combine.
- Place in the oven and cook for 30 minutes, stir well, and cook for an additional 30 minutes until the top is blackened in some places.
- Pour everything into a Dutch oven and blend with an immersion blender until smooth.
- Simmer, uncovered for 45-60 minutes, stirring occasionally. This will thicken the sauce; how long you cook it down is to your preference.
- Stir in the chopped basil and serve immediately.12 large fresh basil leaves
Notes
- Use mixed tomatoes. San marzano tomatoes for sweetness, cherry tomatoes for pop, beefsteak for juice.
- Don’t crowd the pan. One large sheet pan or two smaller ones let the pieces roast, not steam.
- Look for black bits. Those caramelized edges mean the natural sugars have done their job.
- Add basil last. Fresh herbs taste brightest when they skip the long simmer.
- Leave skins on. Blending pulverizes them, and you keep fiber plus fewer steps.No peeling!
- Double the batch. If you’re firing up a 425 degree oven, you might as well roast enough for next time. Your future self will cheer.
Nutrition
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