Season pork with salt & pepper and saute with onion in heavy soup pot coated with pan spray. When onion is golden, add green peppers, garlic & tomatoes. Simmer until pork is tender, about 20-30 minutes. Then add beer, chili powder, cumin, beans & corn. Simmer at least 30 minutes. Add sweetened vinegar. Actually it is better the next day so you may want to prepare this the night before and refrigerate until serving. If you like spicey -- prepare with one Pablano Pepper instead of green peppers. WOW!