For cooking, you should add oil to a hot, dry cast iron pan after preheating it for a few minutes, letting the oil get hot (shimmering/just smoking) before adding food for a good sear and to prevent sticking; but for seasoning, you apply oil to a clean, dry, and cool pan, wipe it thin, and bake it in the oven.
A dozen layers of polymerized flaxseed oil won't matter if your pan is cold and unevenly heated. You need to give it time to get hot—like, really hot—before you start cooking. Preheating is a key way to transform cast iron from a frustrating, sticky mess into the powerhouse it's supposed to be.
When using carbon-steel and cast-iron pans, some people like to heat the dry pan first, then add the oil. This is because high heat causes the oil to oxidize and polymerize, allowing it to bond to the metal, filling in any small pits and divots—a process that seasons the pan, essentially giving it a nonstick surface.
To prevent a soggy or unevenly cooked result, it's also best to add the oil to a hot rather than cold pan. ``The oil or fat usually goes in once the pan is hot, this helps create a protective layer that prevents sticking and promotes even browning,'' Littley explained.
Pour about 1 Tablespoon of oil into the pan (or other cast-iron cookware item) and rub a thin coating of it over the entire surface with a paper towel. Place the pan in the 300-degree oven and leave it in for an hour; remove pan from oven.
A little oil goes a long way when it comes to refreshing your cast iron. We only use 1/2 teaspoon of neutral oil (per side) on a 10.25" pan before baking at 450° F degrees for an hour. Too much oil can lead to sticky or splotchy pans ➡️ thin layers are key! That's how we like to keep our pans well seasoned.
5 Mistakes That Could Ruin Your Cast Iron Skillet
If you need to put oil into your engine, make sure to turn off your car. Wait a few minutes for the engine to cool down before adding oil. If you add oil to a running engine, you increase the risk of injuring yourself from moving parts and hot surfaces. Additionally, it can lead to inaccurate measurement of oil levels.
If you dig for physically meaningful answers you tend to find that letting the oil heat with the pan (adding cold oil to cold pan) allows more time for the oils to cook and develop bad flavors. Adding oil to a hot pan brings it to temp faster and helps prevent it overcooking.
All in all, you'll want to do this oiling-and-heating process three to four times, to set down a good initial layer of your own seasoning. Once you're done, just let the pan cool down. It's now ready for cooking.
Using Soap on Pre-Seasoned Cast Iron
If you've got a Pre-Seasoned Skillet, one of the worst things you can do is scrub it down with soap after every use. Soap can strip away the seasoning, which is what helps create that naturally non-stick surface.
You shouldn't cook eggs in a cast-iron skillet, especially if it's new or not well-seasoned, because they tend to stick badly, leading to messy cleanup and potential damage to the pan's seasoning. While a perfectly seasoned, older pan can cook eggs with proper low-heat technique, eggs are delicate and can easily pull off the polymerized fat layer, especially scrambled eggs or omelets, making a nonstick pan a better choice for this food.
You can use olive oil to season cast iron, but you need to choose a high quality extra virgin olive oil, which should have a smoke point close to 400 degrees Fahrenheit.
Cooking on unseasoned cast iron can result in sticking, rusting, and a myriad of other issues (some of which are outlined above).
The reason why is that the high temperature of the pan will reduce the viscosity of the oil and allow it to settle into the small little cracks and pores in the pan.
Moreover, it represents the oil's ability to flow at low temperatures and keep its protective properties at high temperatures. Why? Because oil thickens at low temperatures and thins at high temperatures. In cold weather, this means that if an oil is too thick, it becomes difficult to start an engine.
Adding oil to your car immediately after driving isn't recommended. Ideally, you should wait between 10 to 15 minutes to give your engine time to cool down. Once the engine has cooled, you can then fill the engine with new oil.
You should avoid cooking highly acidic foods (tomatoes, wine sauces), delicate fish (tilapia, flounder), and eggs in cast iron, especially if the pan isn't perfectly seasoned, as these can stick or damage the non-stick seasoning, leading to metallic tastes or stuck food. Sticky desserts and strong-flavored foods can also be problematic as cast iron retains flavors.
It sticks less with proper care with time too. If you can cook scrambled eggs with added with cheese in it without sticking you have a good almost perfect piece of cookware. Bare iron begins to rust very quickly, so if you don't see rust, it's probably seasoned. If it's not grey it's seasoned.
This might look intimidating, but remember that you really can't ruin cast iron. Even if you strip away most of the seasoning, you can still rebuild it into the sleek, nonstick skillet you expect.
Some cast iron owners oven season every new piece of cookware they get, and then repeat the process every few months or years. This is a way to speed up the breaking in process, and can also address issues with your seasoning, such as rust.
My cast-iron pan is sticky
If it's still sticky, the pan may be overseasoned. Just line the bottom of your oven, heat it to 450-500°F and let the excess oil drip off over the course of an hour. Turn the oven off and let the pan cool, and if it's still sticky, just repeat the process as needed.
Seasoning is the foundation of cast iron's non-stick surface, but it must be done correctly. Too much oil creates a sticky, uneven layer that won't bond properly with the iron. Too little oil can lead to dry, unprotected spots that result in food sticking.