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1
Bring 2 cups water and porcini mushrooms to boil in small saucepan. Remove from heat, cover, and soak 20 minutes. Using slotted spoon, transfer mushrooms to work surface; slice thinly. Reserve cooking liquid.
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2
Heat 2 tablespoons oil in heavy large skillet over medium-high heat. Add garlic; stir 30 seconds. Add crimini mushrooms and thyme; sprinkle with sea salt and saute until mushrooms are browned, stirring often, about 12 minutes. Add Sherry; stir until liquid is absorbed, about 1 minute. Set mushroom mixture aside.
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3
Heat 1 1/2 tablespoons oil in another heavy large skillet over medium-high heat. Add onion; cook until translucent and beginning to brown, stirring often, about 6 minutes. Add leeks; reduce heat to medium, sprinkle with sea salt, and saute until vegetables are soft and golden, stirring often, about 15 minutes.
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4
Bring broth to simmer in large pot over medium-high heat. Pour in reserved mushroom cooking liquid, leaving sediment behind. Add all mushrooms, onion mixture, and cayenne. Simmer 1 minute to heat through. Season to taste with salt. DO AHEAD:
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5
Puree cottage cheese in mini processor until smooth. Using electric mixer, beat 3 tablespoons butter and eggs in medium bowl. Add cottage cheese, 1/2 cup flour, 1 teaspoon sea salt, and nutmeg; beat on low speed just to blend. Stir in 1/2 cup flour, cheese, and parsley.
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6
Bring large pot of salted water to boil. Using teaspoon, scoop piece of dough about size of cherry. Holding spoon just above boiling water, use second spoon to push dough into water. Working quickly, repeat about 10 more times. When dumplings rise to surface, simmer until cooked through, 2 1/2 to 3 minutes. Using slotted spoon, transfer dumplings to large plate. Repeat with remaining dough. DO AHEAD:
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7
Melt 3 tablespoons butter in large skillet over medium heat. Working in 2 batches, add dumplings to skillet. Cook until brown in spots, 2 to 3 minutes per side.
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8
Bring soup to simmer. Divide dumplings among wide shallow bowls. Divide soup among bowls and serve.
