What does Joy of Cooking mean by "canned spaghetti"?
Canned spaghetti unfortunately is still something that can be bought at supermarkets. A common brand for canned pasta is Chef Boyardee. They have ravioli, spaghetti and sometimes even canned meatballs inside the spaghetti. 



These spaghetti will have a very very soft texture similar to what you would expect the spaghetti texture to be if you overcook it by at least 10 minutes.