Place pork between two sheets of heavy-duty plastic wrap; pound each piece to a 1/4-inch thickness using a meat mallet or rolling pin.
Combine mustard and next three ingredients in a small bowl. Place pork in a shallow dish; spoon 2 tablespoons mustard mixture over pork, turning to coat. Let stand 15 minutes.
Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add pork, and cook 4 minutes on one side; turn pork and spoon reserved mustard mixture over pork. Cook pork 2 minutes or just until done.
Add water, stirring slightly; cook 2 minutes or until slightly thickened. Turn pork to coat, and place on a serving platter. Pour pan juices over pork. Yield: 4 servings (serving size: 2 cutlets).