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Melt butter in a large soup pot. Saute leeks and onions in the hot butter over medium-low heat until the onions are tender. This will take 5 to 10 minutes.
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Add the vegetable broth and bring the mixture to a boil. Add the peas and cook for 3 to 5 minutes until the peas are tender. I used frozen peas and it took about 3 minutes to cook the peas.
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Remove the soup pot from the heat and stir in the chopped mint leaves, salt and pepper.
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Puree the soup.
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Whisk in sour cream or creme fraiche.
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Stir in the chopped chives. Taste for seasoning. Serve garnished with garlic croutons, chopped cilantro, cayenne pepper and/or grated parmesan. Swirl in a little sour cream or creme fraiche to decorate the soup.
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Cook's Note: I think the subtle flavor of the mint is better in this soup on the second day. Also, this soup is very thick. I used some half and half to thin it to my taste.