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spicy caramelised onion burgers square

Spicy Caramelised Onion Burgers

If you are looking for the ultimate burger recipe that’s juicy, bold and packed with flavour, these spicy caramelised onion burgers are going to become your new obsession. We are talking tender, seasoned beef patties, molten cheddar, fresh lettuce, tangy burger sauce and the star of the show – sweet, savoury and fiery spicy caramelised onions.
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Prep Time 10 minutes
Cook Time 1 hour
Course Main Course
Cuisine American
Servings 4

Equipment

  • Large non-stick pan
  • Mixing bowl

Ingredients
  

For the burgers

  • 500 g beef mince 20% fat
  • 1 teaspoon cajun seasoning
  • 1 teaspoon paprika
  • 1 teaspoon garlic granules
  • 1 teaspoon oregano
  • 1 head baby gem lettuce
  • 4-8 cheddar cheese slices 4 if doing single patties, 8 if doing double smashburgers
  • 4 tablespoon burger sauce
  • Handful gherkins
  • 4 brioche buns

For the spicy caramelised onions

  • 1 tablespoon olive oil
  • 1 tablespoon butter
  • 1 fresh jalapeño or green chilli
  • 3 onions thinly sliced
  • Pinch salt
  • 1 teaspoon sugar
  • 1-2 teaspoon chilli oil

Instructions
 

  • Heat olive oil and butter in a large skillet over medium heat. Once melted, add sliced onions, chopped jalapeño and a pinch of salt. Cook slowly, stirring occasionally, for around 20 minutes until softened. Add sugar and continue cooking for another 20 minutes until rich and golden, lowering the heat if needed. Stir in the chilli oil at the end for that fiery kick.
    1 tablespoon olive oil, 1 fresh jalapeño or green chilli, 3 onions, 1 teaspoon sugar, 1-2 teaspoon chilli oil, Pinch salt
  • While the onions are cooking, mix beef mince with Cajun seasoning, paprika, garlic granules, oregano and an egg until just combined. Shape into patties – four for single burgers or eight for double smashburgers. Place each patty on a square of parchment so they are easy to handle.
    500 g beef mince, 1 teaspoon cajun seasoning, 1 teaspoon paprika, 1 teaspoon garlic granules, 1 teaspoon oregano
  • Heat a pan over high heat. Place patties in, parchment side up, and smash down with a spatula before removing the paper. Cook for 3 to 4 minutes until browned, then flip. Add a slice of cheddar to each patty and cover with a lid or foil until melted.
    4-8 cheddar cheese slices
  • Toast brioche buns until golden. Spread burger sauce on the base, add lettuce and gherkins, then layer on your cheesy patties. Finish generously with spicy caramelised onions and top with the bun.
    1 head baby gem lettuce, 4 tablespoon burger sauce, Handful gherkins, 4 brioche buns, 1 tablespoon butter

Notes

Pressing the patties down firmly at the start creates maximum crust and flavour. Use a sturdy metal spatula and parchment paper for easy release. A good crust means better flavour and texture, making your spicy caramelised onion burgers taste like restaurant-quality smashburgers without special equipment.
Keyword burger, burger recipe, caramelised onions, cheese burger, cheeseburger, easy burger, spicy burger
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