"I know NFDM is Non-Fat Dried Milk, But what is the ECA you mention in your recipe?"
Encapsulated Citric Acid. It gives sausage an aged "tang" flavor without having to age it for months. Inexpensive and readily available. I got mine from Amazon and it has become a staple in a lot of sausages. Really adds a LOT of character to the flavor.
does ECA replace buttermilk powder in summer sausage recipes? I thought I read once that buttermilk powder gives a tang to sausage.