Ingredients for 4 servings

servings
  1. 500 ml (2.1 cups) dry white wine
  2. 4 sprigs of fresh tarragon or 50 g (1.75 oz) dried tarragon
  3. a few fresh tarragon leaves
  4. 200 ml (0.8 cup) veal stock
  5. 15 g (0.5 oz) butter in small pieces
  6. salt and crushed pepper (4 g of peppercorns crushed with the bottom of a saucepan)