Ingredients

1 1/2 lbs flank steak (or inside round or sirloin tip)
1/2 cup beer or ale or sherry wine
2-3 garlic clove, minced
1/4 cup ketchup
1 tablespoon chili powder
2 tablespoons balsamic vinegar
2 tablespoons brown sugar
2 tablespoons grainy mustard or Dijon mustard
salt and pepper

Directions

Pierce meat with a fork several times.Place in a plastic bag.Mix other ingredients and pour over meat.Marinate in fridge 12 hours or overnight.Broil or grill steak over medium high heat 5 to 6 minutes per side.Let meat rest 5 minutes when done.Boil marinade in saucepan for 5 to 10 minutes until slightly thickened.Slice steak into thin strips and top with sauce.