1. Prepare grill to medium-high heat.
2. Arrange pork slices in a single layer between 2 sheets of heavy-duty plastic wrap; pound to 1/2-inch thickness using a meat mallet or small heavy skillet. Lightly coat pork with cooking spray; sprinkle with salt and 1/4 teaspoon pepper. Place pork on a grill rack; grill pork 2 minutes on each side or until done.
3. Combine tomato and remaining ingredients in a food processor; pulse until minced. Stir in remaining 1/4 teaspoon pepper. Serve with pork.