This is an earthy, rich-tasting mushroom soup. You could add cream or crème fraîche ... Bring to the boil, then simmer for 5 minutes. Add the sherry, marsala or lemon juice.

Place a saucepan on the range and add the mushroom puree with milk and cream, add the seasoning and remove from heat. Then pour the soup in serving cups. Top it up with the froth, sprinkle truffle oil ...