If you’ve ever heard that tomatoes will “ruin” a cast iron pan, you’re not alone. Cast iron newbies and seasoned home cooks alike have been warned to keep acidic foods far away from cast iron cookware.

But will tomatoes really ruin your cast iron? The truth is a little more nuanced.

For starters, you can cook tomatoes in cast iron. A quick tomato sauce, a chili with canned tomatoes, or a skillet shakshuka is unlikely to damage a well-seasoned pan. However, long simmering times and highly acidic recipes can wear down seasoning and may leave a metallic taste in your food.

Here’s what you need to know.

Why Tomatoes and Cast Iron Have a Complicated Relationship

Tomatoes are quite acidic, with a pH typically between 4.0 and 4.6. Acid can react with the seasoning layer that protects your cast iron pan, and start to break it down.

When seasoning is strong and well-maintained, brief exposure to acidic ingredients usually isn’t a problem. But if the seasoning is thin or damaged, acidic foods can strip away some of that protective layer.

The result may be:

• Dull or patchy seasoning
• Metallic flavors in food
• Increased risk of rust if the pan isn’t properly cleaned and dried afterward

It’s Fine to Cook With Tomatoes When…

Most everyday tomato-based cooking is perfectly safe in cast iron, especially if:

• Your pan is well seasoned
• The cooking time is less than 30 minutes
• Tomatoes are only one ingredient in the recipe
• You clean and dry the pan promptly afterward

Many cast iron owners regularly make dishes like:

• Shakshuka
• Tomato-based skillet pasta
• Chili
• Pizza sauce
• Tomato and vegetable sautés

Without any issues.

When You Might Want a Different Pan

Consider using stainless steel or enameled cast iron if you’re making:

• Long-simmering tomato sauces
• Marinara that cooks for hours
• Large batches of chili that sit on the stove all afternoon
• Recipes with vinegar, wine, and tomatoes (or other highly acidic foods) combined

The longer acidic ingredients remain in contact with even well-seasoned cast iron, the more likely they are to affect the seasoning.

What Happens If You Accidentally Cook Tomatoes in Cast Iron?

The truth? Probably nothing.

At worst, you may notice a dull spot in the seasoning or a slight metallic flavor. In most cases, a quick cleaning and a light coat of oil to reseason is enough to keep the pan in good shape.

If the seasoning looks worn afterward, simply continue cooking with the pan and apply a thin layer of oil after cleaning. The seasoning will rebuild over time.

Tips for Cooking Tomatoes in Cast Iron

If you want to use cast iron for tomato-based recipes, follow these simple guidelines:

1. Start with a well-seasoned pan.
2. Avoid extremely long simmering times.
3. Don’t store leftovers in the pan.
4. Wash, dry, and lightly oil the pan after cooking.
5. Check the seasoning occasionally and touch it up when needed.

The Bottom Line

Can you cook tomatoes in cast iron?

Yes. A well-seasoned cast iron pan can handle most tomato-based recipes without any problems. The main thing to avoid is long, slow cooking of highly acidic foods, which can gradually wear away seasoning and affect flavor.

For quick sauces, shakshuka, chili, and everyday cooking, your cast iron skillet is probably just fine.