With a knife, cut several small slits into the roast. Insert pieces of garlic cloves in roast; place in crockpot with whole pepper and half bunch of cilantro which has been chopped. Season to taste. Pour in beer. Cook on HIGH 4 to 6 hours until fork tender (LOW 9 to 11 hours). Remove meat; shred. Serve with warm tortillas, with by your choice of garnishes. Suggested garnishes: diced tomatoes, onions, sliced ripe olives, shredded lettuce, sour cream, cheese, salsa, guacamole, and cilantro.