Steak and Potato Kebabs

Name: Steak and Potato Kebabs
Ingredients: Vegetable oil, for the grill; 1/2 pound fingerling potatoes, halved lengthwise; 1 1/2 pounds beef tenderloin, cut into 1 1/2-inch cubes; 2 tablespoons extra-virgin olive oil; Kosher salt and freshly ground black pepper; Kosher salt and freshly ground pepper; 1 bunch asparagus, cut into 1-to-2-inch pieces; 1/4 cup ketchup; 2 tablespoons Dijon mustard; 2 tablespoons balsamic vinegar; 1 tablespoon Worcestershire sauce; 2 teaspoons steak sauce; Pinch of red pepper flakes