Simmer clams in lemon juice 15 minutes uncovered. Stir in vegetables. Add seasonings and margarine and stir until margarine is melted. Add breadcrumbs and stir. Put in shallow baking dish. Sprinkle with Parmesan cheese and Paprika. Bake @ 350 degrees for 20 - 30 minutes. May need to skim oil from top before serving. Serve warm with crackers.