Place the onion (halved) into the Thermomix bowl and chop on Speed 8, 10 seconds.
Add the beef mince, onion, egg, breadcrumbs, garlic, Worcestershire sauce and Tabasco sauce and mix on Reverse, Speed 4 until combined (using the spatula to help mix).
Divide mince into 4 equal sized patties and place onto a plate.
Season with salt and pepper.
Cover with plastic wrap and pop into the fridge for 30 minutes or until you're ready to barbecue the patties (*these patties can also be cooked in a frying pan).
Place the beef patties on a barbecue grill to cook.
Turn the patties over once during cooking.
Add the bacon after a couple of minutes. Remove the bacon when crispy and set aside.
Set the burgers aside when cooked to your liking.
Serve the hamburger rolls with bacon, a beef patty, lettuce, tomato, avocado, cheese and cucumber. Top with burger sauce.