preheat a grill to medium high.

prepare the french fries as the label directs; keep warm.

form the beef into four 6-ounce patties, about 3/4-inch-thick.

season the patties on both sides with salt and pepper.

grill the patties until marked on the bottom, about 5 minutes.

flip and cook until marked and slightly firm, about 3 more minutes for medium doneness.

during the last minute of grilling, top each patty with a slice of cheese.

remove the patties to a plate and let rest 5 minutes.

grill the buns, cut-side down, until lightly toasted, about 1 minute.

spread the bun bottoms with ketchup and top with the burger patties and french fries.

cover with the bun tops.