Grate the onion on the fine holes of a grater. You should have about two tablespoons of grated onion (and some juice, which you can discard).

In a bowl, add the ground turkey, Worcestershire sauce, ketchup, salt and pepper; mix thoroughly.

Shape into four patties and press the patties into ½-inch thick rounds.

Grease the frying pan and place over medium-high heat. Once the pan is hot, cook the patties for five minutes on each side.

Serve on buns, with the condiments of your choice.