I think the essence of Kyoto cooking is in eel dishes.
The marrow of reality is the true essence of life. If you look deep down into reality you might even find the true meaning of life! Hmm I wonder what that is... it probably has something to do with a certain two digit number. Oh well.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.