Boil the onions in 2 waters, until well done; then drain. Butter a baking-dish and sprinkle bread-crumbs over the bottom of it, then put in a layer of onions, seasoned with salt and pepper, bits of butter, and more bread-crumbs, covering the onions.
Add another layer of onions, more bread-crumbs and seasoning, and so continue until the dish is full. Then pour in enough sweet milk to thoroughly moisten the whole. Put bits of butter on top, and bake until brown.