Taste, gustatory perception, or gustation the one sense that makes life worth living. Could you imagine if you could not taste food? 
Oh you are so right!  Taste is by far a wonderful sense to have!  
That reaction that happens in the mouth chemically makes me happy daily. The taste of morning coffee, o' my god. 
I like that bitter taste as well.  What allows us to taste?
Taste is the sensation produced when a substance in the mouth reacts chemically with taste receptor cells, amazing right? I need to write a book.
You should!  Let's see, there's sweet, bitter, salty... what else?
sweetness, sourness, saltiness, bitterness, meaty and savoriness. Meaty being my favorite.