Most kitchens move through cookware in cycles. A nonstick pan lasts two years before it scratches, a beloved enameled pot chips on the rim, and a copper saucier needs a tin re-line every decade. The 12 inch cast iron skillet sits outside that churn. With a few minutes of care a month it can serve three generations without complaint.

The reason is the seasoning. Cast iron starts life with a rough, porous surface, but every time you cook fat in it the oil polymerizes onto the metal. Layer after layer, a glassy black coating builds up that releases eggs like a non stick but sears like a steel restaurant pan. There is no chemistry between the food and the surface. It is simply oil that has been cooked into a stable, food safe lacquer.

Use it for a seared steak on Friday, a focaccia on Saturday, a Sunday morning frittata and a Monday cornbread. Wash it with hot water and a soft brush, dry it on the burner and rub a fingertip of oil over the warm surface. Thats the whole maintenance loop. Done well, your cast iron will outlive your refrigerator and your range, and probably your favorite cookbook.

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