- 4 (6-ounces) skinless boneless chicken breast halves
- 1/4 cup extra-virgin olive oil
- 1/4 cup chopped dill
- 3 tablespoons finely chopped shallot
- 1 tablespoon grainy mustard
- 1 tablespoon white-wine vinegar
- 1 pintcherry tomatoes, quartered
- Prepare grill for direct-heat cooking over hot charcoal (medium-high heat for gas); see Grilling Procedure .
- Pound chicken 1/4 inch thick between 2 sheets of plastic wrap with flat side of a meat pounder or with a rolling pin.
- Whisk together oil, dill, shallot, mustard, and vinegar in a large bowl. Set aside 1/4 cup. Sprinkle chicken evenly with 1 teaspoon salt and 1/2 teaspoon pepper, then add to dill mixture, turning to coat.
- Toss tomatoes with reserved dill mixture and 1/4 teaspoon each of salt and pepper.
- Grill chicken, turning once, until just cooked through, 3 to 4 minutes total. Serve topped with relish.