1. Place pork, broth, onion, coriander, cumin, oregano, chilies if using,
and bay leaves in a 5- to 6-quart pan. Add enough water to just cover the
meat. Cover the pan and bring to a boil; reduce heat and simmer until meat
pulls apart easily with a fork (3 to 4 hours).
2. Lift our meat (reserve broth for other uses, if desired). Discard fat.
Place pork in a large roasting pan and bake, uncovered, in a 450 oven until
sizzling and browned (about 20 minutes). Pull off chunks of meat and shred
with 2 forks, discarding fat.
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NOTES : Don't worry if you can't find chipotle chilies. You can add a little
liquid smoke to replace the smokiness of the chipotles, or just omit both
entirely.