How long can you refrigerate spaghetti sauce?
I usually think three days is about tops.
If it's bought and unopened in a can or a jar, then no. If it has been opened then yes you have to refrigerate it. If it's in an opened can, transfer the contents to another container and refrigerate. If it's homemade sauce, yes you have to refrigerate. If you want to keep it longer than several days, freeze it.
Why can a bottle of spaghetti sauce sit un opened on the market shelf but when you get home you have to refrigerate it?
Make the spaghetti separately from the sauce. Boil water in a pot filled three forths to the top and throw in the spaghetti and stir. When it is cooked, drain the water out of the pot and put the spaghetti in a bowl! For the meat sauce you want to get one or jars of spaghetti sauce, my favorite is Classico, and pour it into a pot. Stir it, then while you are heating it…