Thai Walnut BBQ Chicken Bowl

Name: Thai Walnut BBQ Chicken Bowl
Ingredients: Marinade:; 3 tablespoons soy sauce; 2 tablespoons fish sauce; 3 tablespoons cooking sherry; 2 tablespoons brown sugar; 1/2 teaspoon ground black pepper; 2 minced garlic cloves; 1/4 teaspoon dried crushed red pepper flakes; Bowls:; 4 boneless, skinless chicken thighs; 2 red bell peppers, thickly sliced; 1 cup cooked brown rice; 4 cups fresh arugula; 1 cup canned garbanzo beans, drained and rinsed; 1 cup California walnuts halves and pieces; Sweet and Sour Dipping Sauce:; 2/3 cup rice vinegar; 1/3 cup brown sugar; 1/2 teaspoon dried crushed red pepper flakes; 1 tablespoon fish sauce