Cut meat into 1-inch cubes.
In a bowl, combine garlic, soy sauce, oil, cumin and coriander.
Add meat and stir to coat, then cover and refridgerate for at least 2 hours or until next day, stirring occasionally.
Prepare Basting Sauce and Peanut Sauce. Soak 10 to 12 long bamboo skewers in water.
Lift meat from marinade and thread 4 or 5 pieces of meat on each skewer.
Arrange skewers on a lightly greased grill 2 to 4 inches above a solid bed of hot coals.
Grill, turning often, until well browned and done to your liking. Cut to test (8 to 10 minutes for medium-rare).
About 3 minutes before meat is done, brush all over with Basting Sauce. Serve with the Peanut Sauce.