Step 1

Preheat oven to 350ºF.

Step 2

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.

Step 3

Meanwhile, to make sauce: mix together mayonnaise, ketchup, mustard, and relish.

Step 4

Remove burger from oven and cover with cheese. Return to the oven for a few minutes just until the cheese is melted.

Step 5

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.

Step 6

Assemble burger with bread boule covered in sauce, lettuce, burger patty with cheese, tomatoes, pickles, and top bun.

Step 7

Enjoy warm!