If using fresh spinach, bring 1 inch water to a boil in a 6- to 8-quart pot over high heat. Add spinach, a few handfuls at a time, and cook, turning with tongs, until wilted, 3 to 5 minutes. Drain in a colander and rinse under cold water.
Thoroughly squeeze cooked fresh or thawed frozen spinach in small handfuls to remove excess moisture, then coarsely chop and transfer to a bowl.
Melt 3 tablespoons butter in an 8-inch heavy skillet over moderately low heat, then cook onion and garlic, stirring, until softened, 3 to 5 minutes. Add onion mixture to spinach along with salt, pepper, nutmeg, and cream and stir to combine.
Put oven rack in upper third of oven and preheat oven to 400°F. Butter a 3-quart shallow baking dish (13 by 9 inches; not glass).
Cut squash to separate bulb section from solid neck section, then cut pieces lengthwise into 1/8-inch-thick slices with slicer.
Layer squash and spinach mixture in baking dish, using about one fifth of squash and one fourth of spinach for each layer, beginning and ending with squash. Sprinkle top layer of squash evenly with cheese and dot with remaining 2 tablespoons butter, then cover directly with a sheet of parchment or wax paper. Bake until squash is tender and filling is bubbling, 25 to 30 minutes. Remove paper and bake gratin until browned in spots, 10 to 15 minutes, or broil 3 inches from heat, 2 to 3 minutes.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	269.11 Kcal (1127 kJ)
Calories from fat	119.11 Kcal
		% Daily Value*
Total Fat	13.23g	20%
Cholesterol	41.23mg	14%
Sodium	597.34mg	25%
Potassium	1780.73mg	38%
Total Carbs	35.76g	12%
Sugars	4.9g	20%
Dietary Fiber	8.19g	33%
Protein	8.52g	17%
Vitamin C	96.3mg	161%
Vitamin A	2.4mg	79%
Iron	7.4mg	41%
Calcium	294.4mg	29%

Amount Per 100 g
Calories	62.05 Kcal (260 kJ)
Calories from fat	27.47 Kcal
		% Daily Value*
Total Fat	3.05g	20%
Cholesterol	9.51mg	14%
Sodium	137.74mg	25%
Potassium	410.61mg	38%
Total Carbs	8.25g	12%
Sugars	1.13g	20%
Dietary Fiber	1.89g	33%
Protein	1.96g	17%
Vitamin C	22.2mg	161%
Vitamin A	0.5mg	79%
Iron	1.7mg	41%
Calcium	67.9mg	29%

* 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.

Tastes

salty
savory
bitter
sweet

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