Tarragon is a wonderful flavoring for lamb and a refreshing change from rosemary or mint. Chef Francis Garcia of Bordeaux freezes fresh tarragon with great success, then uses it in its frozen state. To prepare fresh tarragon for freezing, drop the sprigs into boiling water. Remove at once and refresh in a bowl of ice water. Drain, pat dry, and place the sprigs on sheets of paper towels. Roll up the towels into cylinders. Pack in plastic bags and freeze. Frozen tarragon will