We call that mix a 'lubumba'. I can't recall which exactly is, but I can give you a couple of possible names of the cocoa drink: Cacaolat, Okey, ... I thinlk it may be Cacaolat.
--------------------
I have just spoken with a friend of mine who lives in La Rioja (about 50 to 70 miles from PAmplona), and he thinks it is Kaiku (a basque make), so it will be difficult to find outside the Basque country and whereabouts.
Ignacio
[ 09-05-2001: Message edited by: Ignacio ]