Munching Europe’s most famous chocolate cake — the Sacher torte — in Cafe Sacher, across from Europe’s finest opera house, I feel underdressed in my travel wear. Thankfully, a coffee party ...

But the O’Bryonville patisserie’s signature sweet is the Opera Cream Torte: a trifecta of dark chocolate, white chocolate, and vanilla opera cream. The ultimate challenge? Eating just one slice. A ...