Peel and halve the onion. Wash the chicken breast. Boil up with onion and peppercorns in 1 litre salted water. Cover and simmer for about 45 minutes. Skim off any foam that may have formed. Clean the leek, wash thoroughly and cut into thin rings.
Remove the chicken breast and let it cool down a little. Remove flesh from skin and bone. Pour stock through a sieve. Wash the raisins and let them drip off. Heat the fat in a pot. Brown the leek in it. Sprinkle with flour and curry, sweat briefly. Add the stock while stirring. Add the raisins. Bring everything to the boil, cover and simmer for about 15 minutes. Cut meat into slices and heat up in the soup.
Brown the leek in it. Sprinkle with flour and curry, sweat briefly. Add the stock while stirring. Add the raisins. Bring everything to the boil, cover and simmer for about 15 minutes. Cut meat into slices and heat up in the soup. Refine with cream and season to taste with salt and pepper. Dust with curry