Birthday steak

This does bring up a question that I have never fully explored for an answer.

I've heard/read differing "schools of thawt" regarding whether you should add pepper to a steak prior to grilling, or if you should add it at the end. What I've heard is that adding it prior to/during the grilling process causes the pepper to turn bitter. Just curious as to others opinions.

Oh, and Happy Birthday OP!