Blue Cheese Beef Burger with Caramelised Onions & Crispy Rosemary
Caramelised onions and lettuce counterbalance the pungent flavour of tangy blue cheese, while crispy rosemary gives a great texture in contrast to the juicy burger meat.
1.In a large pan over medium heat, heat oil. Add rosemary and fry for about 1 minute, or until the leaves are crispy. Use tongs to pluck the sprigs out of the oil and place on a paper towel. When cool enough to handle, pull the leaves from the sprigs.
2.Add the onions and 1/4 teaspoon of kosher salt to the pan and stir to coat. Cover and let cook, undisturbed, for 7 to 8 minutes, until they start to soften. Remove the lid and continue to cook until softened and caramelised, stirring occasionally, 7 to 8 minutes more. Remove from the heat and stir in the rosemary leaves.
3.Preheat the oven (with the oven rack in the middle) to 180°. Heat a large frying pan, preferably cast-iron, over medium heat. Add the beef burgers and cook for 5 to 6 minutes, until the undersides have a nice dark brown crust. Flip the burgers and cook for 5 to 6 minutes more for medium doneness. (Be careful of the splatters!!)
4.Transfer the burgers to an oven tray. Dividing evenly, crumble the blue cheese over each burger. Bake until the cheese melts, 2 to 3 minutes. Warm your buns in the oven at the same time.
5.Build your burgers with the buns, patties, lettuce, caramelized onions and rosemary.
4 x Beef burgers
3 tbsp. extra-virgin olive oil
4 fresh rosemary sprigs
2 medium red onions, thinly sliced into half-moons