Burps That Taste Like Lunch...Not Dinner

Okay ladies and gentlemen.  For this one I am reaching out to you.

Why when you burp does it sometimes taste like a food that you had earlier in the day even if you have eaten since.

For example:  You have a piece of cucumber involved in your lunch.  Later that evening you have pasta with red sauce.  While watching American Idol you burp.  You are alone so it is loud...and awesome.  Then you notice that it tastes like cucumber and not what you just ate.

Insert more examples...won't write them because they are endless.

Let me know what you find!