Preheat oven to 400 degrees. Bring a large pot of water to boil over high heat, add a generous amount of salt to taste and the rigatoni and cook, stirring occasionally, for 12 minutes, or until the pasta is almost al dente. Strain the pasta in a colander, rinse it under cold running water, and toss with 1 tablespoon of oil.
With a slotted spoon remove the soaked mushrooms from the liquid and strain the liquid through a fine sieve lined with dampened cheesecloth or a coffee filter into a bowl. Reserve. If the Porcini mushrooms are still dirty, rinse them and pat dry. Trim the stems and coarsely chop the mushrooms.
In a 2 1/2 quart ovenproof casserole set over moderately low heat, melt the butter and add the onions, and salt and pepper to taste and cook, stirring occasionally, for 20 minutes, or until the onions are golden brown and tender. Transfer the onions to a plate.
Add the pancetta to the casserole, increase the heat to moderate and cook, stirring occasionally, for 15 minutes, or until the pancetta begins to brown. With a slotted spoon, transfer the pancetta to the plate with the onions. Add the Portobello mushrooms to the casserole, season with salt and pepper and cook the mushrooms, stirring occasionally, for 10 minutes, or until tender. Add the garlic and cook, stirring for 1 minute. Add the chopped Porcini mushrooms, strained mushroom juice, onions, pancetta, 1/2 cup of the Parmesan, and the heavy cream to the casserole and simmer, stirring occasionally, for 10 minutes, or until mushroom flavor is pronounced in the cream. Add the pasta, spinach, thyme, salt, and pepper and gently toss the mixture with the remaining Parmesan. Transfer the casserole to the oven and bake for 20 minutes, or until cream is bubbling.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	703.23 Kcal (2944 kJ)
Calories from fat	429.51 Kcal
		% Daily Value*
Total Fat	47.72g	73%
Cholesterol	139.28mg	46%
Sodium	1432.09mg	60%
Potassium	757.75mg	16%
Total Carbs	55.05g	18%
Sugars	6.39g	26%
Dietary Fiber	6.89g	28%
Protein	33.85g	68%
Vitamin C	27.2mg	45%
Iron	104.3mg	579%
Calcium	475.3mg	48%

Amount Per 100 g
Calories	145.08 Kcal (607 kJ)
Calories from fat	88.61 Kcal
		% Daily Value*
Total Fat	9.85g	73%
Cholesterol	28.73mg	46%
Sodium	295.45mg	60%
Potassium	156.33mg	16%
Total Carbs	11.36g	18%
Sugars	1.32g	26%
Dietary Fiber	1.42g	28%
Protein	6.98g	68%
Vitamin C	5.6mg	45%
Iron	21.5mg	579%
Calcium	98.1mg	48%

* 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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