When the meat is cooked, you can blot any extra grease off with a paper towel. Then place the meat patties on each of the bottoms of 6 buns. Spread thousand island on top of both of the meat patties.
Unwrap the cheese slices and place them across all of the meat patties. Place the tray back in the oven and let the cheese melt. This will only take a minute or two.
When the cheese is melted, spread the minced onion over the whole patty, then the pickles, then the lettuce. The top with the bun “lids”.
Use a pastry brush and brush the tops of the buns with the melted butter, then add a sprinkle of sesame seed.
Cut the burger into individual servings.
Enjoy!