I'm not a vegetarian, but I don't eat a lot of ground meat. That said, I am supremely enticed by Kenji Alt's Big Mac recipe on Serious Eats ( http://aht.seriouseats.com/archives/2... ). I have a food processor, my girlfriend has a KitchenAid stand mixer. Should I grind the meat for this burger (or any future burgers) in the processor, or buy a meat grinder attachment for the KitchenAid and use that? Is it worth the $50?