The 1903 OED cite for pie a la mode

[Sam Clements]

The  cite from OED is:

    1903 Everybody's Mag. VIII. 6/2 Tea and buns,..apple pie à la mode and
chocolate were the most serious menus.

How do we know that the pie had ice cream on it?  Is there more to the cite
that talks about ice cream?

My reason for askng is that the first cite anywhere which actually mentions
ice cream on the pie is from the 1920's.

Not that I doubt it.  It makes sense.  But show me the ice cream.

SC