If memory serves me correctly, it was butter. However, since it is all symbolic
to begin with, and yes, probably, a bubbemeiseh as well, anything that
nourishes a household and, thereby, turns it into a home, should serve to make
the third item.
If I might offer additional suggestions, it would be to provide the new home
with an all-inclusive siddur, a copy of the Five Books of Moses, a
kiddush cup, shabbos candlesticks, a Havdallah candle, a spice box
and a cover for the challah........when it's there, it just might get