Sweet and sour ling

450g ling, skinned and diced

1 egg white

120g potato starch

½ tsp fine sea salt

2 tbsp rapeseed oil

1 small onion. sliced

1 thumb-sized piece ginger, finely sliced

1 small carrot sliced in rounds

1 bunch scallions, white part cut into 3 cm batons, greens reserved for garnish

1 red bell pepper, cut into chunks

½ a pineapple, cut into chunks

60g honey

60ml red wine vinegar

100g ketchup

1 tbsp soy sauce