Ingredients for 4 servings

servings
  1. 10 cl (0.4 cup) good veal stock
  2. 1 teaspoon strong mustard
  3. 10 cl (0.4 cup) liquid cream (30%)
  4. 3 cl (1 fl oz) cognac
  5. 5 g (0.2 oz) crushed peppercorns (crushed with the bottom of a saucepan)
  6. 20 g (0.7 oz) salted butter
  7. salt