Beef Stew with Ale with thyme

2 tablespoons olive oil 2 lbs boneless beef chuck , cut into 1-inch pieces 1 white onion, chopped 3 celery ribs , diced 1 green pepper , diced 1 garlic clove[...]

3 lbs beef stew meat , preferably chuck, trimmed of excess fat kosher salt fresh ground pepper vegetable oil 2 tablespoons butter 3 yellow onions , thinly[...]