Trim any fat from pork, cut pork into 1" cubes. Toss cubes w/ flour. Spray a lg skillet w/ cooking spray, place over med-high heat. Cook pork until browned on all sides. Transfer to a plate.
Heat oil in skillet. Saute onions, both peppers, garlic and chiles until onion is soft. Return pork to pan. Add 1 cup of water, worcestershire sauce, ginger, slat and pepper to taste.
Drain pineapple juice into skillet. Cover pan, reduce heat and simmer 30 mins, stirring occasioanlly. Stack pineapple and cut into 8 sections. Add pineapple and tomatoes to stew. Simmer, uncovered 10 mins.