I have a 15 year old Kitchen Aid mixer. Long story short, I am contemplating buying a meat grinder attachment as it is no longer possible to buy fresh chopped liver near me. Any ideas about how well this unit works? where is best place to buy it? Any suggestions for used one? Not sure I can justify $50 for making chopped liver 6-8 times annually. The food processor, even with pulsing, just makes it too fine, more like pate. Any advice on solving this dilemma another way? Thanks!