Cut an X into the round end of each chestnut, place on a rimmed baking sheet, put in the oven and add 1/4 cup water to the pan. Roast for 10 minutes; the shells should peel back where cut. Remove from the oven, let cool for a minute or two, and then peel while the chestnuts are still warm. Chop coarsely.
Decrease the oven temperature to 350 degrees F. Spread the breadcrumbs on a baking sheet and bake until dry and golden, about 15 minutes. Put in a large bowl with the chestnuts and cornbread.
In a large saute pan over medium heat, melt the butter, and then add the celery, onions, and chopped liver, and cook until the vegetables are soft, about 8 minutes. Add to the bowl with the chestnuts.
Stir in the chicken stock, parsley, sage, salt, pepper and eggs. Spoon into a buttered 3-quart baking dish and bake, covered, for 30 minutes. Uncover and bake until browned, about 30 minutes.
You can substitute dry-packed bottled chestnuts in a pinch; you'll need 7 ounces. But your house will not smell as good.