Heat first 7 ingredients in a dry skillet over medium heat for about 3 minutes or until fragrant. Stir often.
Transfer spice mixture to blender; add onion, vinegar, ginger, and garlic. Process 2 minutes or until well blended.
Combine pork and spice mixture in a glass bowl, tossing to coat. Cover and chill 30 minutes.
Heat a dutch oven over medium heat. Coat pan with cooking spray. Add half of pork mixture; cook for 5 minutes or until pork begins to brown, stirring often. Transfer to a bowl. Repeat process with cooking spray and remaining pork.
Add broth to pan, scraping pan to loosen browned bits. Add pork mixture to pan. Stir in potato, salt and tomatoes and bring to a boil.
Cover, reduce heat, and simmer 1 hour or until potato is cooked and pork is tender, stirring occasionally.