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- Step 1
To make the beef patty, place the mince, onion, breadcrumbs, egg white, parsley, Worcestershire sauce and mustard in a bowl. Season with salt and pepper. Use your hands to mix until well combined.
- Step 2
Shape the mince mixture into a 2cm-thick, 10cm-diameter patty. Place on a plate. Cover and place in the fridge for 30 minutes to chill.
- Step 3
Place the onion and half the oil in a small saucepan over medium heat. Cook for 15 minutes or until light golden and tender.
- Step 4
Meanwhile, heat remaining oil in small non-stick frying pan over medium-high heat. Add the beef patty and reduce heat to medium. Cook for 4 minutes each side or until just cooked through.
- Step 5
Preheat grill on high. Place the bun, cut-side up, on a baking tray and cook under grill for 2 minutes or until toasted.
- Step 6
Remove the bun from the tray. Place the beef patty on the tray and top with the cheddar. Cook under grill for 2-3 minutes or until the cheddar melts. Place the bun base on a serving plate. Top with tomato, beef patty, tomato sauce, lettuce, beetroot and onion. Top with the remaining bun. Serve immediately.
Rosemary and lemon wedges
Freezing tip: At the end of step 2, place the patty or patties between sheets of plastic wrap and place in an airtight container. Label, date and freeze for up to 3 months. Time plan tip: Prepare to end of step 3 up to 1 day ahead. Store the onion in an airtight container in the fridge. Twenty minutes before serving, reheat the onion in a small saucepan over low heat and continue from step 4. Burger-night tip: To make extra burgers, simply multiply the quantity of each ingredient by the number of burgers you want, then follow the steps above.