"Pureed cauliflower creates a wonderfully creamy soup; meaty shiitakes add textural flair...."
INGREDIENTS
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4 teaspoons extra-virgin olive oil, divided
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3/4 cup thinly sliced leek, white and light green parts only
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3/8 teaspoon kosher salt, divided
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4 cups coarsely chopped cauliflower florets (about 1 medium head)
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1 1/2 cups unsalted chicken stock (such as Swanson), divided
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3/4 cup water
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2 teaspoons chopped fresh thyme
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1/4 cup 2% reduced-fat milk
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1 1/2 teaspoons butter
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1/4 teaspoon white pepper
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1 (3.5-ounce) package shiitake mushroom caps
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1 teaspoon lower-sodium Worcestershire sauce
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1 teaspoon sherry vinegar
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2 teaspoons chopped fresh parsley