Originally Posted by chiselchin
i am using marinade on beef and everywhere i read it says to discard marinade after one use. my question is why worry about bacteria if i am cooking the meat afterwords?
Over time, bacteria release toxins which are not neutralized by cooking. As Andy said, you can use the marinade to make a sauce as long a you boil it long enough to kill off any bacteria.
If you make too much marinade and want to save it for another day, set some aside before adding it to the meat, then it will not be contaminated.