Remove roast from refrigerator, and let come to room temperature while you prep other ingredients. Mix paprika, sugar or honey, chili powder, garlic powder, salt and pepper in a small bowl and set aside.
Halve the onions and slice into rings. Halve and core apples and pears, and cut into slices. Smash and peel the garlic cloves.
Pat the roast dry with paper towels. Using 1-2 tablespoons of your spice mixture, rub into roast to coat well.
Place onion rings in the bottom of your slow cooker, and set roast on top. Sprinkle apples, pears, and bay leaves around the roast, then drizzle chicken stock or water around the edges. Cover with lid, and cook on low for 8-10 hours, or on high for 6-8 hours.
Once done cooking remove roast from slow cooker and place on a cutting board. Once cool enough to handle, shred with two forks and set aside.