Slow Cooker Tagine-Inspired Chicken

Name: Slow Cooker Tagine-Inspired Chicken
Cook time: 6 h
Total time: 6 h
Cuisine: Moroccan, African
Ingredients: 1 large yellow onion (halved and thinly sliced); 4 garlic cloves (minced); 1 tablespoon grated fresh ginger; 1 ½ teaspoon turmeric; 1 ½ teaspoon paprika; 1 ½ teaspoon cumin; 1 ½ teaspoon ground coriander; 2 cups low-sodium chicken broth; 2 tablespoons tomato paste; 2 teaspoons kosher salt; 1 teaspoon freshly ground black pepper; 2 lb. chicken breasts; 2 teaspoons lemon zest; 2 teaspoons orange zest; 2 tablespoons fresh lemon juice; 2 tablespoons fresh orange juice; ½ cup chopped cilantro (plus more for serving); ½ cup drained and roughly torn pitted green olives; ¼ cup chopped shelled pistachios; Cooked cauliflower rice (or jasmine rice)