Name: Raclette burgers
Total time: 30 min
Yield: Serves 4
Ingredients: 1 small red onion, tough outer layers peeled and discarded; 400g steak mince; 1 tsp celery salt; a handful flat-leaf parsley, finely chopped; 4 slices prosciutto; for frying oil; 4 slices raclette (or use another melty cheese, such as taleggio); to serve shredded lettuce; 4 brioche-style burger buns, toasted; 4 tbsp mayonnaise; 3 tsp sweet american mustard; 6 cornichons, chopped; 4 pickled onions, chopped

1 small red onion
tough outer layers peeled and discarded
400g steak mince
1 tsp celery salt
a handful flat-leaf parsley
finely chopped
4 slices prosciutto
for frying oil
4 slices raclette (or use another melty cheese, such as taleggio)
to serve shredded lettuce
4 brioche-style burger buns
toasted

BURGER SAUCE

4 tbsp mayonnaise
3 tsp sweet american mustard
6 cornichons
chopped
4 pickled onions
chopped

Method

step 1
Grate the onion with a box grater.
step 2
To make the sauce, mix the mayo, mustard, cornichons and pickled onions and season.
step 3
To make the burgers, put the mince, onion, celery salt and parsley in a bowl. Season with pepper and mix well, then divide into four balls. Form each ball into a thin patty – they will shrink as they cook so make the burgers larger than your buns.
step 4
Grill the prosciutto for 2-3 minutes until crisp, then take out but leave the grill on.
step 5
Heat a large, heavy frying pan to hot. Oil and season the burgers then cook for 2 minutes each side until golden and cooked through.
step 6
Put a slice of raclette on each burger and grill for 2 minutes on high until bubbling.
step 7
Add some lettuce to each bun. Sit a burger on top, add the crispy prosciutto, spoon over the sauce and put on the bun top.