Early 19th century; earliest use found in Maria Edgeworth (1768–1849), novelist and educationist. From French ris de veau from ris, of unknown origin + de + veau.
Definition of ris de veau in US English:
ris de veau
(also riz de veau)
nounˌriː də ˈvəʊ
A dish of sweetbreads of veal.
Origin
Early 19th century; earliest use found in Maria Edgeworth (1768–1849), novelist and educationist. From French ris de veau from ris, of unknown origin + de + veau.