First, you'll prepare the heart of the wrap: the seasoned beef. Place your large non-stick skillet over medium-high heat. Add the lean ground beef and use a spatula to break it apart as it browns. Once it’s fully cooked, carefully drain off any excess grease from the skillet.
With the heat reduced to low, it’s time to transform the ground beef into a cheeseburger-flavored filling. Add the Worcestershire sauce, ketchup, dried minced onion, salt, and pepper directly to the beef. Stir everything together until the meat is evenly coated. Let this mixture simmer for about 5 minutes, allowing the flavors to meld together.
Lay your four large flour tortillas on a flat surface. Sprinkle a generous amount of shredded cheddar cheese down the center of each one. Placing the cheese down first ensures it gets nice and melty from the heat of the beef. Evenly divide the warm beef mixture among the four tortillas, spooning it right on top of the cheese.
Now for the classic burger toppings. Drizzle a little mustard over the beef mixture, and add more ketchup if you desire. Place a couple of tomato slices on top. To roll, fold in the sides of the tortilla first, then tightly roll it up from the bottom, burrito-style. This will keep all the delicious fillings contained while grilling.
Preheat your indoor or outdoor grill. Carefully place two wraps at a time onto the hot grill, seam-side down. Grill for 3 to 5 minutes, or until you see distinct grill marks and the tortilla is golden brown and crispy. The heat will also ensure the cheese inside is perfectly melted.
Gently remove the finished wraps from the grill. At this point, you can carefully unroll the top portion to add your fresh ingredients like shredded lettuce and sliced red onion. Adding these last keeps them crisp and fresh. Re-roll the wrap, slice it diagonally in the middle, and serve immediately while it’s hot and melty.