Remove the fish to a warm plate and return the pan to the heat. Add the rest of the butter, wait until this is bubbling, and add the bread cubes. Let these get a little color, until crispy and buttery, but still giving in the middle. Add the lemon juice, allow it to sizzle and turn brown, and add the capers. At the last minute add the parsley and straight away pour over the fish. Season and serve at once.