The mincemeat is the kind we use for Christmas mince pies. Once puréed with the walnut oil, the spicy fruit flavour contrasts well with the peppery livers.
Put the mincemeat, walnut oil and 4tablespoons water into a food processor or blender and blitz to a smooth sauce consistency, with dots of black raisin still visible. Trim the chicken livers and place them on kitchen paper to dry.