Mix first 7 ingredients in a small bowl. Pour over pork chunks and toss to season all over. Set aside. (Do up to one day in advance and store in fridge.)
Place sweet potatoes, green pepper, onion and sweet corn into a slow cooker. Top with seasoned pork, water and undrained tomatoes
Cover and cook on LOW for 7 to 8 hours (preferred) or on HIGH for 3-1/2 to 4 hours until stew reaches 160° on meat thermometer
Add green beans 15 mins. before end of cooking time. For best results, avoid lifting the lid until then.