500g/1lb 2oz floury potatoes, peeled and diced
2 tbsp chopped fresh parsley
1 small red onion, finely chopped
6 spring onions, finely chopped
6 firm tomatoes, deseeded, diced
2 tsp Dijon mustard
2 tbsp full-fat mayonnaise
dash of hot pepper sauce, such as Tabasco
salt and freshly ground black pepper
100g/3½oz Japanese panko breadcrumbs
1 tbsp oil
4 tbsp olive oil
1 tbsp white wine vinegar
knob of butter, plus extra for greasing
500g/1lb 2oz cod loin, skinned
130g/4¾oz dressed crab or 100g/3½oz mixed fresh crabmeat (tinned is fine)