Tiffany Eslick’s bone marrow and raclette fondue burger
French 30 Mins Prep · 45 Mins Cook
- Peel and finely slice the onions.
- In a deep pan, heat the butter and oil. Add the onions and cook on a low heat, stirring frequently. Once softened add ½ tsp of salt and sugar. Cook gently, stirring to make sure the bottom doesn’t catch, for 20-30 minutes or until onions are soft but still hold shape. Finish by stirring in the balsamic, taste for seasoning and cool completely.
- For the mustard mayo, finely dice the cornichons and capers. In a medium-sized mixing bowl, add the mayonnaise, diced cornichons, diced capers, cornichon pickling water and Dijon mustard. Combine using a whisk and cover with cling film and refrigerate.
- Heat a large cast-iron pan over a medium-high heat or set a gas BBQ to high.
- Season the burger patties on both sides with the remaining salt and the pepper and place on the grill. Sear for 4-5 minutes on either side. In the last 2 minutes, place 2 slices of raclette cheese on each patty, close the grill and allow the cheese to melt.
- Thinly slice the gherkins.
- Meanwhile, halve the buns, brush the insides with French butter and toast on the grill for 2 minutes.
- To assemble, divide the mayo between the buns and spread to evenly cover the base. Place 2 lettuce leaves on each bun and top with the patty. Sprinkle some smoked paprika over the cheese. Divide the gherkin slices between the patties and top with 1-2 tbsp of the caramelised onions.
- Close the burgers. Using toothpicks, skewer the cornichons then hold each burger together with a toothpick. Serve immediately.
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