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 sauté over moderately high heat, stirring, until vegetables are softened, about 5 minutes. Add garlic and sauté, 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 425°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 350°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.
Cooks' notes: Stuffing can be prepared and onions can be stuffed 1 day ahead and chilled, covered. Bring stuffed onions to room temperature before baking.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	1400.86 Kcal (5865 kJ)
Calories from fat	566.38 Kcal
		% Daily Value*
Total Fat	62.93g	97%
Cholesterol	49.94mg	17%
Sodium	13682.05mg	570%
Potassium	4233.52mg	90%
Total Carbs	78.09g	26%
Sugars	5.67g	23%
Dietary Fiber	6.05g	24%
Protein	106.26g	213%
Vitamin C	14.8mg	25%
Vitamin A	0.2mg	8%
Iron	33.1mg	184%
Calcium	126.4mg	13%

Amount Per 100 g
Calories	18.5 Kcal (77 kJ)
Calories from fat	7.48 Kcal
		% Daily Value*
Total Fat	0.83g	97%
Cholesterol	0.66mg	17%
Sodium	180.7mg	570%
Potassium	55.91mg	90%
Total Carbs	1.03g	26%
Sugars	0.07g	23%
Dietary Fiber	0.08g	24%
Protein	1.4g	213%
Vitamin C	0.2mg	25%
Iron	0.4mg	184%
Calcium	1.7mg	13%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

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