Answer:
I'm often served as a "rack of ..." I'm often smoked or grilled, with bones in, and slathered in BBQ sauce.
Seven brothers, five work all day, The other two, just play or pray.
Who plays when he works and works when he plays?
What is often returned, but never borrowed?
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.