150g raclette, chopped into pieces
400g Maris Piper potatoes, skin on
50g salted butter, plus extra for the frying pan
100g self-raising flour, plus extra for dusting
½ tsp sea salt flakes
ground to make ½ tsp black peppercorns
3 tbsp Dijon mustard
3 tbsp white wine vinegar
1 shallot, finely chopped
a handful pickled silverskin onions, finely chopped
a handful gherkins, finely chopped
½ a small bunch flat-leaf parsley, finely chopped