Given the task definition and input, reply with output. In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

Heat oven to 450 degrees., Place ribs in roasting pan., Place lemon and onion slices on top., Roast uncovered for 30 min., Mix remaining ingredients; pour over ribs., Reduce oven to 350 degrees and bake for 1 1/2 hrs., Baste during baking.
country style ribs, lemon, onion, catsup, Worcestershire sauce, chili pwdr, salt, water