Answer:
assuming you already have the seeds which have been toasted and are very hard, grind them in a mortar and pestle. ...Better yet, remove the seeds from the pod they came in, PLANT the seeds, so you'll have more carob in the future, and dry the now empty pods at low heat. Then, grind the PODS in a mortar, WITH a pestle. Or, if you are feeling lazy, break up the pods, toss the bits into one of those little coffee grinders, put the coffe grinder on a towel on the kitchen counter, put the lid on the coffee grinder, and put two copies of "The Joy of Cooking" on top of the lid (one copy is generally too light). If it's plugged in (the grinder, not the book), it should start grinding up the dried pods for you, leaving you to relax & enjoy a cup of hot carob at the kitchen table (preferably with little rubber bungs in your ears; those coffee grinders are pretty loud. Also, keep an eye on it to make sure the books don't fall off too soon. Check the powder now & then until its as fine as you desire).