Your favorite cast-iron pan can turn a perfect meal into a bitter disappointment. One long simmer can leave an unwelcome metallic taste, while yesterday’s bold flavors may linger where you least expect them. But before you blame the skillet or swear off breakfast forever, there’s a crucial difference between foods to avoid and mistakes that quietly ruin your season.

Cast iron can serve your kitchen for decades, but bare, seasoned pans need a little judgment. Long cooking times with tomatoes, lemon juice, or other acidic ingredients can weaken seasoning and give food a metallic edge. A brief splash isn’t the same as simmering tomato sauce for an hour; stainless steel or enameled cookware is the safer choice for prolonged acidic cooking. Fish, garlic, and pungent cheeses may also leave lingering aromas without necessarily damaging the pan.

Eggs, however, don’t belong on a universal “never cook” list. They can cook beautifully in well-seasoned cast iron with gentle preheating, sufficient butter or oil, and controlled heat. Sticking usually points to technique or an uneven cooking surface—not eggs absorbing seasoning. After cooking, wash with mild dish soap, dry thoroughly, and apply a very thin coat of oil. The goal isn’t to fear your favorite skillet, but to understand when another pan makes dinner easier.