From: Smitten Kitchen
10 medium red and yellow onions (4 lb)
1 lb sliced bacon, cut crosswise into 1-inch-wide pieces
3 celery ribs, cut crosswise into 1/2-inch-thick slices
1 teaspoon salt
1 teaspoon black pepper
3 garlic cloves, minced
15 oz baby spinach, trimmed and coarsely chopped (14 cups)
1 (9-inch) round loaf country-style bread (1 1/4 lb), cut into 1/2-inch cubes (10 cups), lightly toasted
2 cups salted roasted cashews (10 oz), coarsely chopped
1 stick (1/2cup) unsalted butter, melted
1 1/4 cups turkey giblet stock
Make onion shells: Cut a 1/2-inch-thick slice from tops of onions, discarding tops, and trim just enough from bottoms for onions to stand upright. Scoop out all but outer 2 or 3 layers from each using a small ice cream scoop or spoon (don’t worry if you make a hole in the bottom), reserving scooped-out onion and onion shells separately.
Make stuffing: Coarsely chop enough scooped-out onion to measure 3 cups.
Cook bacon in 2 batches in a 12-inch heavy skillet over moderate heat, stirring, until crisp, about 10 minutes, then transfer with a slotted spoon to paper towels to drain, reserving about 1/3 cup fat in skillet.
Add chopped onion, celery, salt, and pepper to skillet and sautÃƒÂ© over moderately high heat, stirring, until vegetables are softened, about 5 minutes. Add garlic and sautÃƒÂ©, stirring, 1 minute. Transfer mixture to a large bowl and stir in spinach, bread, cashews, butter, 1 cup stock, and bacon, then cool completely.
Roast onions: Preheat oven to 425Â°F. Arrange onion shells, open sides up, in a 13- by 9- by 2-inch baking pan, then add 1/2cup water and cover pan tightly with foil. Roast onions in middle of oven until tender but not falling apart, 25 to 30 minutes.
Stuff and bake onions: Reduce oven temperature to 350Â°F. Transfer shells to a work surface and pour off water in pan. Fill shells with stuffing, mounding it, and return to pan. Reserve 5 to 7 cups stuffing for turkey cavity, then put remaining stuffing in a buttered shallow 3 1/2-quart baking dish and drizzle with remaining 1/4 cup stock.
Bake stuffed onions and stuffing in dish in middle of oven, uncovered, until heated through, about 25 minutes.