Preheat oven to 350°. In a bowl, toss pork with oil and pepper. Place a large skillet over medium-high heat. Add pork; cook and stir 2-3 minutes or until browned. Remove from heat.
To assemble, spread mustard onto center of tortillas; layer with ham, cheese, pickle, onion and pork. Fold bottom and sides of tortillas over filling and roll up. Place on an ungreased baking sheet; bake 4-6 minutes or until heated through.