So here's the recipe, which is copied from White Castle Shares Turkey Stuffing Recipe:
10 White Castle hamburgers, pickle removed
1-1/2 cups diced celery
1-1/4 teaspoon each ground thyme and ground sage
1-1/2 teaspoon coarse ground black pepper
1/4 cup chicken broth
Tear burgers into small pieces and place in a large mixing
bowl. Add celery and seasonings. Toss and add chicken broth.
Toss well. Stuff cavity of turkey just before roasting. Makes
about 9 cups, enough for a 10 - 12 lb. turkey. Note: Allow
one White Castle hamburger for each pound of turkey, which will
be the equivalent of 3/4 cup of stuffing per pound.