Spray 3- to 4-quart slow cooker with cooking spray. Place pork in cooker.
In blender, place tomatoes, tomato paste, honey, garlic, chili powder and salt. Cover; blend on medium-high speed 10 seconds, stopping blender frequently to scrape sides. Pour over pork.
Cover; cook on Low heat setting 8 to 10 hours.
Remove pork from cooker; place on cutting board. Shred pork with 2 forks; return to cooker and mix well.
Serve pork mixture on tortillas with toppings. Pork mixture will hold on Low heat setting up to 2 hours.