These ingredients made enough for about 6 people...
1/2 head of celery, finely sliced
1 medium onion, diced
1 tbsp sage
1 package ready chestnuts, coarsely chopped
10 slices bread
butter to taste
Big lump of butter in the pot, add celery and onions and saute until onions are translucent and celery is soft. Add butter as necessary so nothing sticks or burns. Stir regularly.I add the sage about halfway through so it doesn't burn but infuses everything with its herby goodness. Add chestnuts. Add stock. Cube bread and add. Give it a good stir so the flavours coat the bread. Add water carefully - we want stuffing not soup! Keep stirring the water in so that the stuffing begins to cohere. Decant into a baking dish and cover with foil. I'll set this on the side and pop it in the oven when the final bird comes out to rest (about 30 minutes) and leave it covered in foil.