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Bring chicken stock to the boil in a pan.
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Cut the chicken into bite size chunks and add to the stock, reduce the heat slightly and allow the chicken to boil for 15-20 mins until cooked through.
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Stir in the egg white and asparagus and cook for 2 mins.
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Mix the cornflour with a little water and add to the soup, bring the soup back to the boil.
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Stir in a pinch of tarragon and serve immediately.

