We follow the directions in Old Fashioned Recipe Book: An Encyclopedia of Country Living
Be sure your cast iron is clean before seasoning; all rust removed and well washed and dried.
Preheat oven to 425° F. Rub pan all over with a generous amount of lard or shortening. Place in oven for 15 minutes.
Remove from oven and apply a second coat to the inside only of the pan (be careful…the pan will be very hot!).
Return to the oven for another 15 minutes. After 15 minutes, remove the pan from the oven and apply a third coat. After applying the third coat leave the pan in the oven for two hours, then turn the oven off and let the pan stay in the oven until it has cooled.
Be sure not to leave the lid on a Dutch oven while doing this, the lid will stick on.
Re-season whenever necessary.
Lodge Logic Dutch Oven with Loop Handles