Beef with stew

3 lbs beef , bottom round Trimmed of most fat and cut into 1 and 1/4-inch chunks sea salt and fresh ground black pepper 1 tablespoon olive oil 1 sweet onion ,[...]

2 tablespoons olive oil 2 1/2 pounds beef chuck or round, trimmed of surface fat and cut into 1 inch cubes Salt and freshly ground black pepper to taste 2[...]