Cheeseburger Macaroni & Cheese with Burger Relish Topping | epicuricloud (Tina Verrelli)

Ingredients

• 1-2 tablespoons salt ((for water))
• 1 box/pound elbow macaroni
• 1 pound lean ground beef
• 3/4 cup finely chopped onion
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1/3 cup ketchup
• 1/2 stick (4-tablespoons) butter
• 1/4 cup (+2 tablespoons) flour
• 1/4 teaspoon white pepper
• 2 teaspoons dry mustard
• 1/4 teaspoon salt
• 4 1/2 cups whole milk
• 1/2 teaspoon Worcestershire sauce
• 3/4 pound sharp cheddar cheese (shredded)
• 6 ounces American cheese (from deli, not pre-packaged slices) (cut into strips)
• 1 tablespoon butter (melted)
• 1 cup panko (breadcrumbs)
• 1/8 teaspoon salt and pepper
• 2 large dill pickles (diced)
• 2 plum tomatoes (diced)
• 2 large leaves romaine lettuce (cut into small pieces)
• 1/4 cup finely mined red onion