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Grilled Burger with Caramelized Onions, Mozzarella and Bacon served on a white plate on a red bandana
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Grilled Burger with Caramelized Onions, Mozzarella and Bacon

This Grilled Burger with Caramelized Onions, Mozzarella and Bacon recipe is perfect for grill season, and beyond. It's a flavour explosion you will not want to miss out on!
Prep Time15 mins
Cook Time15 mins
Total Time30 mins
Course: Burger, Dinner
Cuisine: American
Keyword: grilled burger, grilled burger with onions, mozzarella and bacon
Servings: 4


For the Patties:

  • 1.5 kg ground beef don't go too lean or you will have brick like burgers, fat is good in burgers
  • 1 cup Italian Bread Crumbs
  • Salt and Pepper to taste

For the Caramelized Onions:

  • 1 large sweet vidalia onion, cut into thin strips
  • 3 tablespoons butter
  • Salt

For the Toppings:

  • Mozzarellissima Cheese regular mozzarella will suffice, I used about 1 cup or so, thinly sliced
  • Caramelized Onions
  • Barbecue Sauce use your favourite
  • Bacon use as much or as little as you like (Candied Bacon would be the bomb on these)
  • 1 package of hamburger buns


  • Preheat your grill to a medium heat.
  • Pre-cook bacon or make it on the grill. I microwaved my batch for these. Lay paper towels on a plate, then lay a layer of bacon, lay another paper towel over top, add another layer of bacon and pop in the microwave to cook for about 3 to 5 minutes depending on how much bacon you are using, the thickness of it, and how well done you like your bacon.
  • Use a cast iron skillet for the onions to cook on the grill.
  • Make sure your cast iron pan is pre-seasoned, very important.
  • Scoop the butter into the cast iron pan, then toss in the onions. Cook over the grill on medium heat until the onions go golden brown, which can take 10 to 15 minutes. If you want to speed it up use a touch of brown sugar. Stir them often to keep from sticking, and add extra butter if necessary. Make sure you are being safe and do not touch the cast iron pan with your hands. I leave the handle sticking out so it's not actually over direct heat. And I also have a cast iron pan handle cover which helps keep people from grabbing the hot handle by mistake.
  • While your onions are caramelizing you can start working on your burgers.
  • In a large bowl combine the ground beef and the italian bread crumbs. Mix lightly so the crumbs just work into the ground beef enough to be evenly mixed. Do not over-work ground beef when making burgers, it makes them tough.
  • Now shape them into large patties. Mine made 6 large burgers and 4 tiny mini-me size burgers (she likes hers super small and super thin). Again, do not over-work your meat, just shape them slightly and don't over-pack too tightly.
  • Now press your thumb into one side in the middle so you leave a small indent.
  • Sprinkle with salt and pepper now.
  • Pop those bad boys on the grill and cook for about 4 minutes on the first side. Then add your cheese and cook for about 4 minutes on that side. If you like your burgers to still moo shave off some time and cook them for about 2 minutes on each side. We tend to be well done, and medium folks here. If mini-me sees blood it's bad news.
  • Another tip that helps when grilling is not to over do the turning. People flip too much. Don't be an extreme flipper. It's not good. For you or your meat.
  • Now take your onions and your burgers inside.
  • Set out all your condiments and have at it.
  • I did bottom bun, hamburger pattie, barbecue sauce, caramelized onions (lots), bacon (lots) and then my top bun. It was delightfully huge and delicious!
  • Enjoy with a big old I can barely get my hands around this thing smile!