Grate one yellow onion and squeeze out excess moisture. In a large bowl, combine the turkey, grated onion, minced garlic, mayonnaise, Worcestershire sauce, kosher salt, and black pepper.

Gently mix the turkey mixture until just combined; avoid overmixing.

Divide the mixture into four portions and shape each into patties about 1 inch thick.

Place patties on a lined baking sheet and freeze for at least 20 minutes.

Preheat the grill to medium-high heat, around 450-500°F, and clean the grates.

Grill patties for 6-7 minutes on each side, adding cheese during the last 2 minutes if desired.

Let the patties rest for a minute, then assemble on toasted buns with toppings of choice.