Brachot on Food and on Smell

Pizza, Pretzels and Pastry

When is the Bracha Hamotzi and when is it a Mezonot?

The Borders: How Much is Ours

“Baruch Hu U’varuch Shemo” in Zimun

It is unclear to me whether one is supposed to say “Baruch hu u’varuch shemo” at the end of zimun and if so, who is supposed to recite it. What is proper?