1.In A Large Skillet, Cook Pork In Oil Over Medium Heat For 2-3 Minutes On Each Side Or Until Juices Run Clear. Season With Salt And Pepper. Remove And Keep Warm. 2.In A Bowl, Combine The Flour And Water Until Smooth. Stir In The Vinegar, Sugar, Mustard, Worcestershire Sauce, Salt, Celery Seed And Pepper; Pour Into The Skillet. Add Vegetables. Cook And Stir Over Medium Heat Until Mixture Comes To A Boil. Cook And Stir For 2 Minutes Or Until Thickened And Vegetables Are Crisp-Tender. Top With Pork; Cover And Heat Through.