I don't do anything to burgers other than brush them lightly with oil, add some salt and pepper, and cook. Plain ground beef, no fillers, no other seasonings.
The older I get the more I seam to appreciate the less is more when it comes to food. Start with top notch ingredients, season just enough to compliment the quality ingredients and cook to perfection. You simply can't go wrong.
I'd just add, a good bun, thin sliced red onion and tomatoes, bit of mayo and ketchup and you have a good burger.
