Pulled chicken sandwiches with dr. pepper barbecue sauce

Ingredients

• 1 cups minced onion
• 1 tablespoon . oil
• 3 cups Dr. Pepper
• 2 cans diced tomatoes
• 1 cup orange juice
• 1 cup honey
• 1/2 cup apple cider vinegar
• 1 teaspoon. cayenne pepper
• Salt to taste