Wash the cast iron with hot water and a small amount of mild soap if needed
Scrub off any rust or old residue
Dry the pan completely with a towel
Heat the pan on the stovetop over medium heat until all moisture evaporates
Apply a very thin layer of oil to the entire surface, inside and out
Use a high-smoke-point oil such as flaxseed, canola, grapeseed, or vegetable oil
Wipe off all excess oil until the pan looks almost dry
Place the pan on the stovetop over medium to medium-high heat
Heat until the oil begins to smoke lightly
Rotate the pan occasionally so the heat spreads evenly
Keep heating for several minutes, then turn off the heat
Let the pan cool completely
Repeat the oiling and heating process 2 to 4 times
After each use, clean, dry, and lightly oil the pan to maintain the seasoning