In a blender, PROCESS the first ten ingredients (down to the pork).

REMOVE the mixture to a large bowl and ADD the pork, TOSSING well.

COVER and REFRIGERATE for one to eight hours.

HEAT two tablespoons oil in a large, heavy pan over medium high heat.

ADD onions and COOK until golden, about five minutes.

ADD the seasoned pork and COOK, STIRRING, until lightly browned, about three minutes.

ADD the tomatoes and cinnamon stick; bring to a BOIL.

REDUCE the heat, COVER the pan, and SIMMER, STIRRING occasionally, until the pork is tender (about one hour).

STIR in salt, pepper and mustard seeds.

SIMMER, uncovered, until the liquid is slightly thickened (10-15 minutes).

REMOVE the cinnamon stick and STIR in cilantro.