Easy Homemade Roasted Tomato Sauce (And Why I Stopped Canning It)

on May 01, 2026

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I’m Michelle Marine, and I’ve been making this roasted tomato sauce since 2012 — every August and September, when our garden is absolutely burying us in paste tomatoes. After 15 harvests, I’ve made enough tweaks to call this recipe truly dialed in. But the most important change I made had nothing to do with the recipe itself. It had to do with how I was storing it.

More on that in a minute. First, let me tell you why this sauce is worth making in the first place: it tastes nothing like anything you’ll buy in a jar. Roasting concentrates the flavor and caramelizes the sugars in a way that stovetop sauces simply can’t match. If you’ve never made sauce this way, this summer is the time to start.

This recipe is perfect for serving over pasta, turning into a quick weeknight soup, or using anywhere a recipe calls for canned crushed tomatoes. And once you’ve made it, you’ll want to make it in bulk — so keep reading for exactly how to freeze it safely all winter long.

What 15 Years of Making This Sauce Has Taught Me
Ingredients for Homemade Roasted Tomato Sauce
⚠️ Important: Why I No Longer Can This Sauce — And Why You Shouldn’t Either
How to Freeze Homemade Roasted Tomato Sauce
What Can You Make with Homemade Roasted Tomato Sauce?
What I’ve Learned After 15 Summers of Making This
Frequently Asked Questions
Easy, Homemade Roasted Tomato Sauce Recipe

What 15 Years of Making This Sauce Has Taught Me

When I first published this recipe in 2012, I was processing the finished sauce in mason jars using a water bath canner. It seemed like the logical thing to do — I can most of my garden produce, and tomato sauce felt like a natural extension of that. I’d even written a separate post walking readers through how to can roasted tomato sauce.

But I was wrong, and it took me years to understand why.

As I learned more about USDA canning guidelines and food safety science, I realized that this recipe — because it contains oil, garlic, and no measured added acid — is not safe to water bath can. I wasn’t cutting corners. I just didn’t know. Once I understood the science, I switched to freezing immediately and updated my guidance accordingly.

If you’ve been canning a similar sauce at home, please read the food safety section below before your next batch. And if you’re new to food preservation entirely, my complete guide to home canning for beginners is a good place to start — it covers the difference between water bath and pressure canning and which foods are safe for each method.

Ingredients for Homemade Roasted Tomato Sauce

One of the things I love most about this recipe is that everything comes from our garden or my pantry. In a good tomato year I’ll make eight to ten batches between August and October — and every jar in the freezer feels like money in the bank come February.

Paste tomatoes — San Marzano, Roma, or any meaty, low-water variety. I’ve been growing Baker Creek San Marzanos and they’re exceptional for sauce. For tips on growing the best crop possible, see my post on 19 tomato growing tips for your best harvest.
Fresh garlic — don’t substitute dried. Roasted garlic is a completely different flavor.
Fresh basil — picked fresh and added before roasting
Avocado oil — high smoke point, neutral flavor. Olive oil works too.
Balsamic vinegar — a small amount adds depth and a subtle sweetness
Salt and pepper

various tomatoes for the best roasted tomato sauce

Which Tomatoes Work Best?

Paste tomatoes — San Marzano, Roma, Amish Paste — are ideal because they have more flesh and less water than slicing tomatoes. Less water means more concentrated flavor and a thicker finished sauce without hours of reducing on the stove.

That said, I throw in whatever the garden gives me. Cherry tomatoes, grape tomatoes, even slicing tomatoes all work fine. The sauce may be slightly thinner, but the flavor is still excellent. In a bumper tomato year, I’m not being picky. If you end up with more tomatoes than you can sauce, my guide to canning crushed tomatoes the quick and easy way is a great companion method for your harvest.

How to Make Roasted Tomato Sauce — Step by Step

Prep the tomatoes. Wash well, cut out any bad spots, remove the stem end. Halve or quarter depending on size. I do not peel them — the skins blend out completely and peeling is not worth the time.

Arrange in a 9×13 baking dish. Use a deep dish rather than a sheet pan. Tomatoes release a significant amount of liquid and a sheet pan will overflow into your oven. (Ask me how I know.)

Add aromatics. Tuck whole garlic cloves and fresh basil leaves throughout the tomatoes. Drizzle generously with avocado oil, add a splash of balsamic vinegar, and season well with salt and pepper.

Roast at 425°F for one hour. They’ll look a little charred and collapsed when they come out. That’s exactly right. Your kitchen will smell incredible.

Cool for 15–20 minutes. Don’t rush this — hot liquid in a blender is dangerous.

process roasted tomato sauce in the vitamix

Blend until smooth. I use a Vitamix. Start on low, increase to high, and blend for about 30 seconds. The result is a silky, deeply colored sauce unlike anything from a jar.

⚠️ Important: Why I No Longer Can This Sauce — And Why You Shouldn’t Either

For years, I processed this sauce in a water bath canner and even published instructions showing readers how to do the same. When I dug into USDA canning safety guidelines more carefully, I learned that this recipe — as written — is not safe to water bath can.

Here’s the problem: the combination of oil and garlic creates conditions where Clostridium botulinum can survive the water bath process. Botulism toxin is produced in low-acid, oxygen-free environments — exactly the kind that can develop inside an improperly canned oily sauce. It is odorless and tasteless, which means you cannot tell if a jar is contaminated.

The USDA only approves tested, lab-verified recipes for home canning for exactly this reason. A recipe that “seems fine” for canning may not have the verified acidity or processing time needed to be genuinely safe. This sauce has not been tested and approved for water bath canning. For a deeper explanation of which tomato recipes are and aren’t canning safe, see my complete home canning guide.

The fix is simple: freeze it instead. Frozen roasted tomato sauce is just as delicious, lasts up to three months, and carries none of the risk. I actually prefer it now — I think the texture holds up better after freezing than it ever did after canning.

If you want a canning-safe tomato sauce, my homemade pizza sauce with fresh tomatoes is a tested, water-bath-safe alternative that’s also made from roasted garden tomatoes. For plain crushed tomatoes, see my quick crushed tomato canning method. Both follow proper USDA acid requirements.

This easy homemade roasted tomato sauce is perfect on pasta and in soups. It only uses a few ingredients and is a pretty hands off way to make a fabulous tomato sauce.

How to Freeze Homemade Roasted Tomato Sauce

Freezing is the right preservation method for this sauce. Here’s exactly how I do it after a big batch:

Cool completely before filling any container. Don’t rush this step — freezing warm sauce causes ice crystals and texture loss.
Leave at least one inch of headspace at the top of every jar or container. Liquid expands as it freezes and will crack glass or pop a lid without room to expand.
Use freezer-safe containers. Wide-mouth mason jars work well as long as the glass is freezer-rated (not all mason jars are). Freezer-safe Pyrex or heavy-duty freezer bags laid flat also work great.
Label everything. Include the date and the quantity. Future you will be grateful.
Use within three months for best quality, though it will technically remain safe beyond that if held at a steady 0°F.

My system: I freeze in two-cup portions — roughly the right amount for one pasta dinner or a base for soup. That way I’m never thawing more than I need. This sauce pairs especially well with the fall seasonal eating approach I write about — make it in August and September when tomatoes are at their peak, and you’re set through winter.

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What Can You Make with Homemade Roasted Tomato Sauce?

This sauce is more versatile than a standard marinara because roasting gives it a depth and sweetness that works across a lot of different dishes:

Pasta sauce — the obvious one. Toss with any pasta, finish with parmesan.
Roasted tomato soup — thin with broth, add a splash of cream. Done in ten minutes.
Pizza sauce — use it straight from the container. My homemade pizza sauce post covers the full canning-safe pizza sauce version if you want to go that route instead.
Shakshuka base — add cumin, smoked paprika, and eggs poached directly in the sauce.
Braising liquid — use as a base for braised chicken thighs or Italian sausage.
Anywhere a recipe calls for canned crushed tomatoes — this is richer and better in every application.

Here are a few recipes where this homemade sauce shines!

What I’ve Learned After 15 Summers of Making This

A few things I’ve refined over the years that don’t fit neatly into a recipe card:

Make more than you think you need. Tomatoes shrink dramatically in the oven. What looks like an overflowing pan going in will be a modest amount of sauce coming out. I always roast two pans at minimum.
Don’t pull them at 45 minutes. I’ve tried it to save time. The caramelization isn’t the same. The full hour matters.
Cherry tomatoes make it sweeter. When I have a lot of cherry tomatoes, I add them to the pan. They collapse quickly and add a natural sweetness that balances the acidity beautifully.
The Vitamix changed everything. A regular blender works, but the texture from a high-powered blender is genuinely silkier. If you make this regularly and cook a lot from your garden, it’s worth the investment.
Pair with a fall garden plan. I grow my sauce tomatoes specifically for this purpose. If you want a reliable crop next year, my posts on fall vegetables to plant before winter and fall garden tasks to do before the season ends will help you plan the full growing cycle.

Frequently Asked Questions

Can you can roasted tomato sauce with garlic and oil?

No — and this is important. Roasted tomato sauce that contains oil and garlic is not safe to water bath can. The fat creates anaerobic conditions where botulism-causing bacteria can survive the canning process. The USDA only endorses tested recipes for home canning, and no tested recipe allows for oil or garlic added before processing. I canned this sauce for years before I understood this. Please freeze it instead. If you want a canning-safe option, see my canning-safe pizza sauce recipe.

How long does homemade roasted tomato sauce last in the freezer?

Up to three months at best quality. It’s technically safe beyond that if properly frozen at 0°F, but the flavor and texture begin to decline after three months. Label your containers with the date so you use the oldest portions first.

Do you have to peel tomatoes for homemade sauce?

No. When you blend roasted tomatoes at high speed, the skins break down completely. After 15 years of making this sauce, I have never once peeled a tomato first. It’s not worth the time.

What are the best tomatoes for homemade sauce?

Paste tomatoes — San Marzano, Roma, Amish Paste — give you the best flavor and the thickest sauce because they have less water content than slicing tomatoes. That said, any ripe tomato will work, including cherry and grape tomatoes! For growing tips specific to sauce tomatoes, see my post on getting your best tomato harvest.

Can I use this sauce as pizza sauce?

Yes, and it’s excellent — use it straight from the container. Note that this version is not safe to water bath can. If you want a shelf-stable pizza sauce made from garden tomatoes, see my separate canning-safe homemade pizza sauce recipe.

What can I use instead of a Vitamix?

A regular countertop blender works fine — blend in batches and don’t fill more than halfway with hot liquid. An immersion blender also works directly in the pan after the tomatoes have cooled, though the texture won’t be quite as smooth.

Is roasted tomato sauce the same as marinara?

Not exactly. Traditional marinara is made on the stovetop with raw crushed or pureed tomatoes and cooked briefly. Roasted tomato sauce starts in the oven, which caramelizes the sugars and concentrates the flavor in a way stovetop cooking can’t replicate. The result is richer, deeper, and slightly sweeter than marinara.

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