Insert garlic cloves in roast, or just crush the cloves and drop in the pot with the meat; place in crockpot with whole pepper and half bunch of cilantro which has been chopped. Season to taste with black pepper and salt. Pour in beer. Cook on high 4 to 6 hours until fork tender. Remove meat; shred. Package, label, date and freeze.
To serve, defrost in microwave or refrigerator. Pile the hot meat on a plate. Serve steamed corn or flour tortillas, and with your choice of chopped tomatoes, diced onion, shredded cheese, yogurt or sour cream, lettuce and cilantro.