Then puree the soup, strain through a fine sieve and season with salt and pepper.
Heat the olive oil in a pan and roast the bread cubes until golden. Drain on kitchen paper and lightly salt.
Bring the soup to the boil again briefly before serving and add the truffle oil. Mix the butter in smaller pieces with the whipped cream into the soup. Mix the soup until frothy, distribute on plates and add the croutons.
Tip:
The soup is very easy to freeze - preferably before the truffle oil, butter and whipped cream are added.