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Melt butter in a heavy soup pot over medium low heat. Add the onions and thyme to the pot and saute, stirring occasionally, until the onions are tender. This will take about 10 minutes.
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Add the sliced carrots to the onion mixture. Add salt. Cook for five minutes.
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Add the vegetable broth and simmer the soup until the carrots are tender. This will take about 30 minutes.
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Puree and adjust seasoning. Add the cream. Not having heavy whipping cream in my refrigerator, I used half and half (not whipped) and I was generous. Add the dairy to your taste.
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Garnish with chopped herbs.