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Heat 1 tbs butter in a soup pot, Add the peas and the garlic, and heat them through. Add the flour, and stir this, making sure the flour is all dissolved.
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Add 1 quart of hot or boiling water.
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Add salt and pepper.
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Add the chopped onion, and simmer the soup for 45 minutes.
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Fry the sorrel in 1 tbs butter in a small pan, and add this to the soup.
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Finally, beat the egg yolk, and add this to the soup just before serving to make it smooth.