Clean the beef heart, remove fat, cut them into equal sizes, find a size that can be skewered, and set it aside.
Add all the ingredients to a bowl except the beef heart, use a wisk to integrate them then add the beef heart, and let it rest in a fridge for at least 2 hours.
Set up Grill, get it hot
Once the grill is hot skewer the meat, and cook on a grill (3 to 5 min per side) depending on the size of your meat, use the glace every minute or so to prevent it to get dry.
Once cooked set aside and serve with sides while hot.