Ingredients

• canola oil, for frying
• 4 (4-ounce) skinless cod fillets (about 4- x 4-inch large and 1-inch thick)
• 1 teaspoon kosher salt, divided
• 1 large egg
• 1 tablespoon mayonnaise
• 1 tablespoon dijon mustard
• 1 tablespoon corn starch
• 1 tablespoon all-purpose flour
• 1/4 teaspoon paprika
• 2 cups panko (japanese-style breadcrumbs)
• 4 brioche hamburger buns, split
• 4 (1/2-ounce each) processed american cheese slices
• 2 teaspoons tap water
• mcdonald's tartar sauce
• cooked shoestring fries, for serving