Actually - according to Miriam Webster, bold (as an adjective) has 7 different definitions, most of which don't, to me, describe an emotional sate, per se. Definition #6 is 'standing out prominently' , so, in that case, I'd say that a particular taste could definitely be "bold"...
But then, food, to me, doesn't just taste like "food" ... Certain tastes have a profound effect on my emotions. Actually - I think this is proven - especially with chocolate... I'm sure someone will correct me if I'm wrong.