2 garlic cloves, finely sliced
1 lemon, juice only
1 red pepper, thinly sliced
1 yellow pepper, thinly sliced
4 very ripe tomatoes, seeds removed, chopped
500g/1lb 2oz waxy potatoes, peeled and cut into 3cm/1录in cubes
50g/2oz capers in salt, rinsed and drained
salt and freshly ground black pepper
3 tbsp olive oil
2 large or 4 small mackerel, scaled and cleaned
25ml/1fl oz white wine