Cube the beef hearts into 1 inch cubes then whisk together all of the marinade ingredients then toss the beef hearts in the marinade so they are completly coated. Chill for at least 4 hours. Overnight is best.
Soak Wooden Skewers for about 30 minutes. Preheat grill to 400 degrees F
Place 4-5 cubes of beef heart on each skewer. Then place the beef heart satay on the grill and cook for about 3-4 minutes per side so that the internal temp is about 135 degrees F.
As the beef is grilling brush on remaining marinade to keep the beef moist.