Skewered Beef Tenderloin with Balsamic and Ketchup Glaze

1 pound beef tenderloin
1 tablespoon ketchup
1 tablespoon balsamic vinegar
2 teaspoons olive oil
1 teaspoon salt
½ teaspoon red pepper flakes
½ teaspoon pepper
Juice of ½ a lemon
2 six inch skewers




Trim fat from beef tenderloin and cut into cubes. Set aside. In a bowl, whisk together all of the other ingredients. Add beef and stir to coat. Marinate for 1 hour. Skewer the meat, divided among two separate skewers, packing the cubed beef tightly. Heat grill pan, and apply non-stick spray. Cook beef for 2 minutes on each sided, total 8-10 minutes. Remove and rest 5 minutes before serving.