Ingredients:
In a heavy bottomed
saucepan, fry off the onions and garlic in the butter until softened. Do
not colour.
Add the stock and potatoes and bring to the boil. Simmer for 15-20 minutes
until they are cooked.
Chop up the watercress (leaves and stalks) and add to the soup with the
freshly grated nutmeg if using. Simmer for 2-3 minutes before blending in
a food processor in batches. Add the cream as you go.
Return to the pan to gently heat through and season.