Portobello Mushroom Bolognese Sauce
Ingredients:
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1 onion, quartered
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1 large stalk celery, halved
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1 carrot, quartered
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4 large portobello mushrooms, stemmed
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1 tablespoon vegetable oil, or to taste
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salt to taste
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½ cup white wine
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¼ cup milk
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¼ teaspoon ground nutmeg
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2 (15 ounce) cans whole tomatoes, or more to taste
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½ cup water