1 tablespoon olive oil |
1 1/2 pounds sirloin tips or round steak, cut into 1-inch cubes |
4 cups thinly sliced leek (about 4 large) |
3 1/2 cups quartered mushrooms (about 8 ounces) |
2 cups (1/4-inch-thick) sliced carrot |
1 tablespoon brown sugar |
1 teaspoon dried thyme |
1/4 teaspoon salt |
1/4 teaspoon black pepper |
1 (14 1/4-ounce) can fat-free beef broth |
1 (12-ounce) bottle light beer |
2 tablespoons cornstarch |
2 tablespoons red wine vinegar |