Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           vegetable oil
     1/4  cup           fresh lemon juice
     1/2  teaspoon      freshly ground pepper
   6                    chicken breast halves
                        -- skinless -- boneless
   3      tablespoons   tarragon vinegar
   2      tablespoons   dry white wine
   1      teaspoon      dried tarragon
   4      tablespoons   butter or margarine
   2      tablespoons   style-style mustard

Preparation:

1. In a shallow dish, combine oil, lemon juice, and pepper. Add chicken and turn to coat with marinade. 2. Marinate, turning occasionally, for 30 minutes. 3. Meanwhile, combine vinegar, wine, and tarragon in a small non-aluminum saucepan; boil until reduced to about 2 tablespoons. Reduce heat to low, add butter and mustard, and stir until butter melts. Set sauce aside; keep warm. 4. Drain chicken well. 5. Grill over medium heat, turning once, and basting frequently with mustard sauce, until just cooked through, about 5 minutes a side. Be careful not to overcook chicken. Source: 365 Ways to Cook Chicken, by Cheryl Sedaker