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Slice onion into paper-thin slices, place into a bowl, add 1 teaspoon of salt and combine—cover bowl with lid or plastic wrap, and place into the refrigerator for 1 hour.
Form 6-8 equal-sized ground beef balls. Season tops lightly with salt and black pepper. The onion already contains salt, so do not over season. Place onto a parchment lined pan.
Preheat flat top grill for high heat.
Drain onions of excess liquid. Place them into a clean towel and squeeze out any additional moisture. Transfer to a clean dish.
Lightly oil griddle surface and set down about 1/4 cup of sliced onions with a ground beef ball on top. Smash the ball into the onion, creating a burger patty. Cook for 3-4 minutes, gently turn and cook for another 5 minutes, or until the internal temperature of the patties reaches 165 degrees F.
Once cooked, assemble burgers and enjoy! Store leftovers in an airtight container in the refrigerator for up to 4 days.