Mexican Chicken Tostadas with Street Corn

Ingredients

• 1 cup chicken broth
• 14 ounces crushed tomatoes
• 1 tablespoon taco seasoning
• 1 tablespoon brown sugar
• 1 teaspoon garlic powder
• 3 canned chipotle chilis in adobo, minced
• 2 boneless, skinless chicken breasts
• 1/2 red onion large, sliced thinly
• 1/2 cup water
• 1/2 cup white vinegar
• 1 tablespoon sugar
• 1 tablespoon kosher salt
• 2 teaspoons black peppercorns
• 1 teaspoon mustard seeds
• 1 teaspoon coriander seeds
• 1/2 cup sour cream
• 1 tablespoon heavy cream
• 1 pinch kosher salt
• 3 ears corn shucked
• 1/2 lime juiced
• 1 pinch kosher salt
• 1 pinch black pepper
• 4 cups canola oil
• 4 flour tortillas small to medium sized
• 1 cotija shredded
• 1/2 cup cilantro roughly chopped