I have the Kitchenaid meat grinder attachment that works with the mixer. It functions alright for a light usage. I notice that some greyish black residue on the meat after a few minutes of use. In the beginning I thought it because the grinder was new, but after using it for several year and careful washing, this residue still exists.
Question, why is that happening and is the blacken meat safe to eat? TIA
I use usually the 3rd and the 4th grinding plates