Place the mince beef in a medium sized bowl, season with pepper and mix well. Divide the mince into 4 evenly sized balls and flatten into burger shapes with the palms of your hands. Cut the avocado in half, remove the stone and scoop out the flesh and then cut into even sized cubes.
Place the avocado in a small bowl, then add the mayonnaise, lime zest and juice, season with pepper and mix well. Cook the burgers for 3 to 4 minutes on each side, or to your liking. Once cooked remove and keep in a warm place.
Cook the bacon for 1 minute on both sides, until crispy. Place the burgers in the buns, top with tomatoes and onions, then the avocado mayonnaise and finish with the crispy bacon and serve.
If you have avocado leftover try adding a squeeze of lemon juice to prevent it going brown.
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For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.