Beef Stew with greens

2 tablespoons olive oil 1 1/2 lbs beef stew meat 10 cups water 4 large carrots , peeled and diced 4 stalks celery , diced 1 onion , chopped 2 cups frozen[...]

1 teaspoon olive oil 2 cups white pearl onions 2 cups baby carrots 2 medium leeks , well-washed and thinly sliced 15 ounces boneless beef loin, cut into[...]