Cut the beef into large pieces if they are not already cut into tips.
Mix all other ingredients in a bowl but only use half the oil, salt and pepper. Reserve the remainder for just before grilling.
In a zip lock bag, place tips and marinade and marinate overnight or at least six hours.
Prior to grilling, drain well and discard marinade. Dry the tips with paper towels.
Pre-heat grill to medium high.
Coat tips in remaining oil (2 tablespoons), salt (1/2 teaspoon) and pepper (1/4 teaspoon) and grill about two minutes on each side for medium rare. (Note: Cooking time may vary depending on the heat output of your grill and/or if you cook these in a grillpan on the stove.)