Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           Dijon mustard
   2      tablespoons   fresh lemon juice
   1 1/2  teaspoons     Worcestershire sauce
     1/2  teaspoon      dried tarragon
     1/4  teaspoon      freshly ground black pepper
   4      halves        chicken breast -- boneless skinless

Preparation:

Combine the first five ingredients, mixing well; spread on both sides of chicken. Place chicken on a plate. Marinate at room temperature for 15 minutes or for several hours in the refrigerator. Grill, uncovered, over medium coals, turning once, for 10 to 15 minutes or until juices run clear.