Cook the pork in a pressure cooker, with water to cover, for 20 minutes.
Reduce pressure under cold water. Open pot and add posole, lime juice, and chile.
Add water - about twice as much as the amount of posole.
Cook for 45 minutes under pressure.
Reduce pressure under cold water. 2. Remove the pork and cut up.
Put posole, pork, garlic, oregano, and salt in a large covered pot and simmer 1-3 hours, or until hominy kernels have burst and are soft but not mushy. Serve alone or as a side dish.
Notes
The cooking times are for higher altitude cooking. At lower altitudes, where the boiling point is higher, you may need to try shorter cooking times.