a la mode (adv.)

also alamode, 1640s, from French à la mode (15c.), literally "in the (prevailing) fashion" (see a la + mode (n.2)). In 17c., sometimes nativized as all-a-mode. Cookery sense in reference to a dessert served with ice cream is 1903, American English; earlier it was used of a kind of beef stew or soup (1753).

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Definitions of a la mode from WordNet
a la mode (adv.)
with ice cream on top or on the side;
we served the apple pie a la mode
a la mode (adj.)
in the current fashion or style;
Synonyms: latest / in style / in vogue / modish