Cook 4 oz of egg noodles to make 2 cups cooked noodles, and drain. While they're cooking you can mix together the rest of the casserole.
Drain the tuna and put it in a large bowl. Use a fork to break it up into small chunks. Mix in the soup, milk, cooked noodles, peas, pimentos (or substitute minced red bell pepper), onions, and Worcestershire sauce.
Put the casserole mix into a shallow 1 1/2 or 2 qt baking dish, greased.
Mix together the bread or cracker crumbs, cheese and butter. (Or use crushed potato chips!). Spread the crumb mixture on top, then bake uncovered at 375 F for 25 -35 minutes.