So called because it is the custom in Périgord for the wedding-guests to take this soup to the newly married couple in the middle of the night, breaking into the nuptial chamber with the hot tourin which, willy-nilly, the young people are compelled to have. Needless to say that by this time the guests, having feasted well, are very merry, and their intrusion is a somewhat noisy affair—and very disturbing!
Chop the onion finely and quarter the tomatoes. Put in a saucepan with a little butter and simmer gently for about 15 minutes. Cover with warm water, bring to the boil, and simmer for 1 hour. Season highly with salt and pepper. Pour the contents of the saucepan through a sieve into a basin and rub the tomatoes and onion through a sieve. Put all in a clean saucepan, bring to the boil, and 10 minutes before serving add the vermicelli, and a few pieces of toasted bread.