1. Soak peas overnight in plenty of non-chlorinated water. Drain and rinse.
2. Put soaked and drained peas, broth and 2 cups of water into pressure cooker or crock pot.
3. Add all remaining ingredients, including spices:
* cut corn kernals from cob
* coarsley chop onion, celery, and pepper
* cube tomatoes into 1/2 inch chunks
* remove and discard seeds from dry chipotle pepper then finely grind the pepper in a coffee mill or morter
4. Bring cooker to pressure and cook on low for 35-40 minutes. (Optionally, cook in the crock pot for several hours.)
5. Check doneness, adjust seasonings, and simmer off extra liquid if needed. Garnish each serving with a few small cubes of avocado, a dollup of sour cream (or yogurt), and a generous sprinkle of chopped fresh cilantro