Given the background description of some cooking related query, summarize the question into a title

Today for the first time, I tested classic egg mayonnaise.All I can say that it smelled strongly like yeast! Is there a way to get rid of that smell? Do mayonnaise in general have that smell?Enlighten please.
How do I get rid of mayonnaise smell?

How can I make hot chocolate drinks made from using instant hot chocolate sachets taste less watery?I work in an office with limited kitchen appliances, we only have access to a tap that dispenses boiling hot or ice cold water and a microwave.I have tried adding milk but that just takes away a lot of the chocolate taste.
How to make Instant Hot Chocolate Taste Less Watery

So I usually buy irradiated beef. From what I understand, the beef is packaged, sealed, and the absolutely blasted with radiation. I'm a nuclear engineer for a living, so I know that most things tend to die when exposed to the levels of dose that this beef is subject to. Normally food spoils by having bacteria and mold and such munch away on it, but here, all of that should be dead.If its perfectly sealed away, and there's nothing living inside the package, how can it spoil?
How does irradiated beef spoil?