Giant Burger

From Nicole Iizuka, POPSUGAR Food

For the burger:
3 pounds ground beef 93% lean
1/4 cup chives, diced
1 cup breadcrumbs
3 eggs
1 teaspoon salt
1 teaspoon pepper

For the sauce:
1 tbsp. butter
2 tbsp. mayonnaise
2 tbsp. ketchup
1 tbsp. mustard
1 tbsp. relish

For garnish:
7 slices American cheese
1 7" shepherd's bread boule
5 pieces lettuce
2 tomatoes, sliced
15 pickle chips

Preheat oven to 350ºF.
To make burger: In a large bowl mix together ground beef, chives, breadcrumbs, eggs, salt, and pepper until combined. Form into a large 8" across patty and place on a wire rack over a sheet tray. Bake for 50 to 60 minutes or until the burger is cooked through.
Meanwhile, to make sauce: Mix together mayonnaise, ketchup, mustard, and relish.
Remove burger from oven and cover with cheese. Return to the oven for a few minutes just until the cheese is melted.
While the burger is cooking, slice bread boule in half and brush the inside with butter. Place in the oven and toast until warmed through.
Assemble burger with bread boule covered in sauce, lettuce, burger patty with cheese, tomatoes, pickles, avocado slice, and top bun.
Enjoy warm!