Shoga means ginger and yaki means grilled. Beef and chicken are sometimes used but the expectation is pork. The trick to this marinade, beside lots of soy sauce, is to grate the ginger, garlic and onion so that it sticks to the pork and adds a charred texture to the finished meat. The truly best way is to grill over white-hot charcoal, but flattop grills can be used as well.