You can use livers/kidneys whatever you want really, pretty simple recipe
Just chop them and put them on skewers. I usually like bigger pieces, they tend to be juicier in the center and then BBQ them, preferably on charcoal, maybe even a little bit charred on the outside. And then dip them into the sauce
Sauce: Soy sauce, fresh ginger and chillies, honey/sugar, lime
Crush the ginger and chillies in the soy sauce, add a little honey/sugar and leave it overnight. Just before you dip the liver in, squeeze some lime juice.
Inspired from the streets of Thailand, enjoy!