foam.    Pieces  or  dollops     of  these   flavored
butters  can     then    be  melted  into    a   rich,
flavorful   coating atop    a   piece   of  meat    or  fish,
or  on  some    vegetables  or  pasta,  or  they    can be
swirled into    an  otherwise   finished    sauce.
Turning  Butter  Back    into    Cream:
Enriching    Sauces  with    Butter  Butter  is
remarkable  for being   a   convertible emulsion.
This     offspring   of  cream   can     be  turned  back
into     cream!  Its     convertibility  is  what    makes
butter  so  useful  as  a   finishing   enrichment  for
many     sauces,     including   simple  pan
deglazings, and it’s    what    makes   possible    the
sauce    called  beurre  blanc,  literally   “white
butter.”     There’s     only    one     requirement     for
converting  butter  into    the equivalent  of  cream
with    80% fat:    the process must    start   in  a   small
amount   of  water.  If  you     melt    butter  on  its
own,     the     fat     phase   remains     the     continuous
phase,  and the water   droplets    settle  out of  it.
But  if  you     melt    butter  in  some    water,  then