Salvadoran Chicken Sandwich

Name: Salvadoran Chicken Sandwich
Cuisine: American, Latin American
Ingredients: 4 bone in chicken thighs or drumsticks; 1 medium onion, chopped; 4 garlic cloves, minced; 1 green bell pepper, chopped; 1 large tomato, chopped; 2 cups chicken broth; 2 tablespoons Worcestershire sauce; 1 teaspoon ground cumin; 1 teaspoon paprika; 1 tablespoon vegetable oil; Salt and pepper to taste; 2 medium tomatoes, diced; 1/2 cup tomato paste; 1 medium onion, finely chopped; 1 teaspoon annatto (achiote) powder (optional, for colour); 1/2 teaspoon sugar; 2 tablespoons vegetable oil; 1 cup chicken broth (reserved from cooking the chicken); 4 Salvadoran style bolillos or French rolls, sliced lengthwise; 1 cup shredded lettuce; 1 cup sliced cucumbers; 1 cup sliced radishes; 1 cup pickled vegetables (such as carrots, cauliflower, and jalapeños); 1/2 cup mayonnaise; 1/4 cup mustard