Slow-Cooked Guava Barbecue Chicken Bowls

Name: Slow-Cooked Guava Barbecue Chicken Bowls
Prep time: 20 min
Cook time: 4 h 15 min
Total time: 4 h 35 min
Cuisine: Caribbean
Ingredients: 8 ounces (227 g) guava paste, cut into pieces; 1 cup (240 mL) ketchup; ¼ cup (60 mL) apple cider vinegar; 1 tablespoon (15 mL) Worcestershire sauce; 2 teaspoons (4.6 g) smoked paprika; ½ teaspoon (1.5 g) garlic powder; ½ teaspoon (1.5 g) onion powder; ½ teaspoon (3 g) kosher or fine sea salt; Pinch freshly ground black pepper; Pinch cayenne pepper ((optional)); 1 tablespoon (15 mL) Dijon mustard; 2 pounds (~1 kg) boneless, skinless chicken breasts; Kosher or fine sea salt (, to taste); Freshly ground black pepper (, to taste); Cooked brown rice or quinoa (, for serving); Shredded red cabbage; Cooked black beans; Fresh corn kernels; Diced avocado; Salsa; Chopped cilantro or parsley