Ingredients

Steps

• Season beef mince with salt and pepper and form into four equal patties.
• Chill the patties in the fridge for one hour.
• Whisk egg yolks and Dijon mustard while slowly adding rapeseed oil to create a mayonnaise.
• Stir in beer mustard and lemon juice, then season to taste.
• Rub patties with vegetable oil and grill for 4 minutes per side on a barbecue or griddle pan.
• Toast the brioche buns face down on the heat for one minute.
• Assemble by layering relic, lettuce, tomato, beef, cheese, mustard mayo, gherkins, and onion.
• Secure burgers with skewers and serve immediately.