I had a nice surprise the other day when I found out the local French restaurant here has opened a gourmet mini food store in an add-on area. Among their many offerings is a truffle butter they whip up there . . . seems like I have read on here about uses for black truffle butter, but now am not finding what I'm looking for. How do use use it? How does the taste differ from white truffle oil (which I have)? Does $10 for a small container (@4oz) seem reasonable?