1.Drain The Salmon, Reserving 3/4 Cup Of The Liquid. Flake The Meat. Melt Butter In A Large Skillet Over Medium- High Heat. Add Onion, And Cook Until Tender. 2.In A Medium Bowl, Combine The Onions With The Reserved Salmon Liquid, 1/3 Of The Cracker Crumbs, Eggs, Parsley, Mustard And Salmon. Mix Until Well Blended, Then Shape Into Six Patties. Coat Patties In Remaining Cracker Crumbs. 3.Melt Shortening In A Large Skillet Over Medium Heat. Cook Patties Until Browned, Then Carefully Turn And Brown On The Other Side.