Step 1: Peel and finely slice the potatoes, onions and courgettes.
Step 2: Place the vegetables in a large pan with the milk, and the 600ml water and the crumbled stock cubes; gently bring to the boil, then allow to cook for 40 minutes on a low heat.
Step 3: Turn off the heat and cool; puree in a blender of food processor, reducing to a cream like texture and return the soup to a pan and reheat on a medium heat.
Step 4: Using wooden spoon, beat together the cream, egg yolks and Parmesan cheese in a soup tureen, add the fresh chopped tarragon mix and mix well.
Step 5: Pour in the soup a little at a time mixing gradually mixing with the wooden spoon.
Step 6: Taste and adjust the seasoning to your preference & serve hot.
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