Season and bake the potato slices

• Toss the potato slices with oil, garlic granules, smoked paprika, salt and pepper.
• Spread them in a single layer on a baking tray.
• Bake until golden and crispy, turning halfway.

Caramelise the onions

• Cook the sliced onion in a frying pan over medium-low heat until soft and golden.

Cook the beef

• Add the beef mince to the pan and break it up.
• Season with Worcestershire sauce, salt and pepper and cook until browned.

Make the burger sauce

• Mix the mayo, Greek yoghurt, ketchup, mustard and pickle juice in a bowl.

Assemble and melt the cheese

• Top the crispy potatoes with the beef and caramelised onions.
• Scatter over the cheddar and mozzarella.
• Return to the oven until the cheese is melted.

Finish and serve

• Top with pickles and shredded lettuce.
• Drizzle over the burger sauce.