Preheat the oven to 350°
Slice open (horizontally) the package of Kings Hawaiian Rolls and place the bottom half onto a baking sheet. Place the top half down by its side.
Then, line the bottom half of the buns with sliced American cheese.
In a large skillet, sauté the onion in a little olive oil and add the ground beef. Season the beef with salt, pepper, garlic powder and stir in the Worcestershire sauce.
Turn off the heat and still in the shredded cheddar cheese. This will act as a binder and help the meat stick together.
Add the meat mixture to the bottom of the Hawaiian rolls. Spread it out evenly.
Brush the top of the buns with the melted butter and sprinkle them with sesame seeds.
Place the baking sheet onto the center rack of the oven for about 5 minutes or until the buns are toasted. Be sure to keep an eye on them. They can burn fast!
Once they are done, add a layer of shredded lettuce and diced tomatoes. Drizzle them with ketchup and place the top half of the buns on top.
Finally, slice them into individual portions and enjoy!