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sautee onions and carrots in olive oil over medium heat, stirring occasionally.
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when the onions start to become translucent, add the mushrooms and turn the heat up to high, stirring frequently.
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after the mushrooms have started to brown around the edges, add the nutmeg, ginger, salt, and pepper, and mix well.
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continue sauteeing vegetables until all are cooked but still somewhat firm.
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put mixture into food processor and puree while adding some of the buttermilk or milk.
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return puree to the stovetop pan, then mix constantly over low heat while adding in the rest of the buttermilk and milk.
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continue heating on low until heated through. do not let it boil or the milk will curdle.