In a large mixing bowl, combine the meat, mustard, and 1 tsp of each of the seasonings. Do not overmix the meat.
Using your hands, form 2 half pound patties.
Season the top and bottom of the patties with the remaining kosher salt and black pepper.
Place your burger patties directly on the grates of your grill and let them cook for 5 to 7 minutes per side, until they reach an internal temperature of 135°F.
While your burgers are cooking, toast your burger buns on the grates for 2-3 minutes.
In the last 2 minutes of cooking, add a slice of Swiss cheese to the top of each burger patty.
Remove the patties from the grill and build your burger with your favorite toppings.