2 tbsp fresh basil leaves
1 large red chilli, finely chopped
1 tsp dried red chilli flakes
½ garlic clove, finely chopped
squeeze lime or lemon juice
½ shallot, finely chopped
2 plum or vine tomatoes, sliced
100ml/3½fl oz passata
2 tbsp balsamic vinegar
50ml/2fl oz olive oil
pinch paprika
salt
100g/3½oz salted butter
4 mackerel fillets, skin-on
2 rustic granary bread slices, torn into rough ³¦°ù´Çû³Ù´Ç²Ô²õ