In a large frying pan, melt butter over a medium heat. Fry onions and celery together with the dried herbs, salt and pepper, stirring often, until vegetables are tender, about 10-15 minutes.

Transfer the mixture to a very large bowl. Add the bread cubes and mix well.

If you are making the stuffing ahead: Transfer the cooked vegetable mixture to a large bowl. Let cool and refrigerate in an airtight container for 24 hours. Mix with bread cubes before stuffing the bird.

Stuff the turkey at both ends with this mixture. IMPORTANT: Stuff the turkey just before baking it. Do NOT stuff the bird ahead and let it sit, even in the refrigerator. It can become infected with bacteria and make you quite ill.