Remove the chicken livers from the milk. Mix the breadcrumbs with the crushed peppercorns. Season with salt. Cut the slices of bread into discs with a plain biscuit cutter and toast them. Rub each slice with garlic. Season the watercress and add a tablespoon of olive oil.
Heat a frying-pan with the remaining tablespoon of oil and the butter. Roll the livers in the peppered crumbs and pa