I saw this on food network and decided to give it a try. It was awesome. I used regular breadcrumbs and added a half of a red onion b/c I had some left over. The store I went to didn't have ground veal so i just used all lean ground beef and it turned out great! Leftovers made good sandwiches too!
I have made this many times and my whole family loves this with a few modifications. We cut back on the veggies slightly by using only half a yellow and red bell pepper and halof of a zuchinni, otherwise the meatloaf was almost TOO moist. I also just use regular Italian bread crumbs instead of the panko. Lastly we cut the balsamic in half because it was just too tangy with as much as his recipe calls for. They key to the flavor of this are the combination of meats and the fresh thyme, it makes a really huge difference so don't use dried thyme. AWESOME!