en casseroleadv.
Of a dish: cooked in a casserole (casserole n.).
ΚΠ
1906 A. Filippini Internat. Cook Bk. 565 Sweetbreads en Casserole. Blanch and trim six heart sweetbreads. Place in an earthen casserole dish [etc.].
1928 A. Christie Myst. of Blue Train xxxii. 264 The waiter deftly served them with chicken en casserole.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2018).
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adv.1906