for all you herring connoisseurs who dont want to spend too much money
you can buy whole or sliced fillet shmaltz herring at any kosher supermarket is imported comes in a blue flat plastic container comes with OK hescher $3.19 @ gourmet glatt $3.99 @ aisle 9 in lkwd for 3 fillets comes either pre sliced or whole fillets ( they even have a larger package must be 10 fillets but dont know price)
i cut up a large onion and put in canola oil let it percolate a few days and you have great tasting herring
i rinse off the original oil as too salty for me