Pork Stew with Beer with shoulder

2 pounds pork shoulder boneless 1 tablespoon olive oil or vegetable 1 medium onion chopped 2 cloves garlic finely chopped 1 can tomato whole * 1 each serrano[...]

1 1/2 lbs tomatillos, husked salt and pepper 4 lbs pork butt or 4 lbs pork shoulder, trimmed,cut into 2 inch cubes 1/2 cup all-purpose flour 1/4 cup canola[...]