Chicken torta ahogada

Ingredients

• 1/2 large white onion thinly sliced
• 1/2 cup white vinegar
• 1 teaspoon granulated sugar
• 1/2 teaspoon kosher salt
• 1 can black beans, drained
• 1 tablespoon bacon fat or vegetable oil
• 1/2 large white onion, diced
• 2 garlic cloves, minced
• salt
• pepper
• 1 teaspoon olive oil
• 4 cloves garlic, minced
• 8 to 10 dried arbol chiles
• 1 15 ounce can of fire roasted tomatoes (shared between both sauces)
• 3 tablespoons white vinegar
• 1/4 cup water
• 1 teaspoon salt
• 1/2 large white onion, thinly sliced
• 4 cups chicken broth or vegetable broth
• 1 teaspoon cumin
• 1 teaspoon dried oregano
• 1/2 teaspoon salt
• Crusty six-inch sandwich roll (or demi baguette)
• black bean spread (from above)
• rotisserie chicken, pulled and chopped into small pieces
• pickled onions (from above)
• savory tomato sauce (from above)
• spicy arbol sauce (from above)
• cilantro, minced (garnish)