Combine vinegar, salt and sugar in medium microwave-safe bowl; microwave 1 minute. Add vegetables; toss. Let stand 30 minutes, tossing occasionally.
Preheat oven to 350°. Combine Hellmann's® or Best Foods® Real Mayonnaise, cilantro, mint, Sriracha and sesame oil in bowl. Set aside.
Arrange flatbreads on baking sheet; bake 10 minutes or until golden. Remove to wire rack; spread evenly with half of the Mayonnaise mixture; top evenly with grilled pork. Bake 2 minutes until pork is heated through.
Remove flatbreads from oven. Drain vegetables, then evenly top pizzas. Drizzle with remaining Mayonnaise mixture and top with cilantro and mint leaves if desired. Cut each flatbread in half.