Cast iron skillets are cherished tools in many kitchens thanks to their durability, heat retention, and ability to last for generations with proper care. While they’re excellent for searing, frying, and baking, not every food or cooking method works well with cast iron. Certain ingredients can affect the pan’s seasoning or impact the flavor of your meals, so knowing what to avoid helps keep your skillet in great condition for years to come.

Foods that are highly acidic, such as tomatoes or vinegar-based dishes, can gradually wear down the skillet’s seasoning, especially when cooked for long periods. Delicate items like thin fish fillets may stick easily due to cast iron’s textured surface, making them difficult to flip without falling apart. Sticky or sugary sauces can cling to the skillet and burn quickly, creating a stubborn mess and weakening the nonstick layer. These types of foods are better suited for stainless steel or nonstick pans, which can handle them with less fuss.

Cast iron can also hold on to strong flavors. If you cook meals with garlic, curry, or bold spices and then immediately use the same skillet for baking, the flavors may accidentally transfer to your next dish. Likewise, boiling food or steaming in cast iron is not recommended, as extended exposure to water can damage the seasoning and increase the likelihood of rust. To preserve your skillet, use it for dry heat cooking while reserving boiling and steaming for other cookware.

Good maintenance goes a long way. Dry your skillet thoroughly, apply a thin layer of oil after each wash, and avoid sudden temperature changes. With a little care—and knowing which foods to skip—you’ll enjoy evenly cooked, flavorful meals while protecting one of the most dependable pans in your kitchen.