I hope it's caramel, like the old Sky Bars I used to eat at the Movie house.
Nuget
The Galactic Center consists of the finest baby frogs, dew-picked and flown from Iraq, cleansed in the finest quality spring water, lightly killed, and sealed in a succulent, Swiss, quintuple-smooth, treble-milk chocolate envelope, and lovingly frosted with glucose.
If you want a serious answer, the center of the galaxy is a giant black hole; its massive gravitational pull helps hold the galaxy together. But I'm not sure if it's nougat flavored.