Gather all your ingredients. Preheat the oven to 375 degrees.
Measure out the bread crumbs, Dijon, and Worcestershire for the loaf.
Finely chop the carrot, parsley, and celery. Finely mince the garlic. Finely dice the onion.
Measure out the ketchup, brown sugar, Dijon and Worcestershire for the sauce. Set aside.
Mix the Loaf
Add the three meats to a large mixing bowl. Add the carrot, onion, celery, parsley, bread crumbs, egg, Dijon, Worcestershire, kosher salt, and pepper to the bowl. Use your hands to mix the ingredients well. You want an even distribution of all the ingredients.
Test the Loaf Salt Level
Grab a small saute pan and heat a smidgen of oil on medium-high heat. Make a small patty out of the meatloaf mixture and when the pan is hot, add and cook until done. Taste the patty to determine if more salt is needed. If more salt is needed add it and remake another patty if you like, or add more and move on.
Mix the Magical Sauce
While the test patty is cooking, mix together in a small bowl, all the sauce ingredients you measured out earlier. Set aside.
Form the Loaf
This meatloaf is "freeformed" on a sheet pan and not placed in a loaf pan. Transfer the meat mixture to a sheet pan lined with parchment paper that has been sprayed with a non-stick spray.
Form the meat mixture into an rounded rectangle shape, somewhat oval. See photo below.
Marry the Loaf and the Magical Sauce
Pour the sauce over the loaf and spread with a spoon or your fingers (my preferred method). You may want to reserve some of the sauce for serving but that is optional.
Bake the Loaf
Insert a probe thermometer into the side of the loaf, pushed in all the way to get as far into the center as possible. Bake at 375 for about an 65 minutes or until the internal temperature reaches 160 degrees.
Slice and Serve
When the loaf is done, remove from the oven and let rest for about 10 minutes. Garnish the loaf with parsley or scallions. Slice the loaf as thick or thin as you like. Enjoy!!
Wrap leftover slices individually and store in the freezer for up to three months.