Beef Stew with fennel

cooking spray 1 1/2 lbs eye of round roast , trimmed and cut into 1-inch cubes 2 cups thinly sliced fennel bulbs (about 2 small bulbs) 1 1/2 cups chopped red[...]

2 tablespoons vegetable oil 1 tablespoon butter or 1 tablespoon margarine 2 lbs boneless beef stew meat or 2 lbs beef chuck , cut into 1 1/2 inch pieces 1[...]