Combine the Braunshweiger and pistachios in a small food processor and pulse until combined. In a separate small bowl, whip the softened cream cheese and mustard together until smooth. Roll the Braunshweiger into 12 small balls. Then take each ball and form about a 1/4 inch thick layer of cream cheese with your fingers. Once you have done all of them, chill for about 30 minutes. Roll each ball in the finely chopped bacon and place on a serving dish. Serve cold, or at room temperature.