ga·nache 
(gə-näsh)
(gə-näsh)n.
A rich icing made of chocolate and cream heated and stirred together, used also as a filling, as for cakes or pastry.
[French, lower jaw of a horse, jowl, good-for-nothing idiot, ganache, from Italian ganascia, jaw, from Vulgar Latin *ganathus, from Greek gnathos; see genu-2 in the Appendix of Indo-European roots.]