INGREDIENTS
500 g
Prawns, raw
4
Celery stalks
2
Garlic cloves
6
Russet potatoes
2 tsp
Spanish onion
2 tsp
Capers, in brine
150 g
Kewpie mayonnaise
1 tsp
Lemon juice
110 g
Caster sugar
1 tbsp
Mustard seeds, yellow
50 g
Salt
4 tbsp
Sea salt flake
500 milliliters
White vinegar
8
Brioche buns, small
4
Cornichons, very finely diced