Cast iron skillets are beloved in American kitchens for their durability and versatility, perfect for searing steaks or baking cornbread. With proper care, they can last generations. However, they aren’t ideal for every food. Certain ingredients and techniques can damage the seasoning, cause rust, or affect flavor.

Acidic foods like tomatoes or vinegar-based dishes can strip the seasoning and leave a metallic taste. Delicate fish like tilapia may stick and fall apart, while sweet sauces can burn and become difficult to clean. Eggs are risky unless the skillet is perfectly seasoned, and strong flavors—like garlic or curry—can linger and affect future meals. To avoid taste transfer, many cooks keep separate pans for sweet and savory dishes.

Moisture is the enemy of cast iron. Boiling water, steaming, or even storing food in the skillet can lead to rust or ruined seasoning. Sudden temperature changes—like adding cold water to a hot pan—can cause cracking. Always allow the pan to cool gradually, and avoid leaving leftovers in it, no matter how convenient.

To keep your skillet in top shape, dry it thoroughly after washing, apply a light oil coating, use mild soap sparingly, and store it in a dry place. When you treat cast iron right—and avoid the common pitfalls—you’ll be rewarded with decades of delicious meals.