Ingredients for 10 servings

  1. 1 carrot
  2. 1 large onion
  3. A small celery branch
  4. A knob of butter
  5. 20 g of lardons
  6. Thyme flowers
  7. 1 bay leaf
  8. 30 cl of alcohol vinegar
  9. 10 cl of white wine
  10. 50 cl of veal stock + 20 cl
  11. 50 g of fresh Paris mushrooms
  12. A dozen black peppercorns