Add onions, carrots, remaining 1/4 teaspoon salt and 1/4 teaspoon pepper to Dutch oven; cook 3 to 4 minutes, stirring frequently, until softened. Stir in garlic and oregano; cook 30 seconds. Add broth; heat to simmering, stirring to remove brown bits on bottom. Transfer mixture to slow cooker with pork. Stir in tomatoes and bacon.