Yes. It's all chicken meat. The neck is dark meat, the back can have some light and some dark. The gizzard and heart are kind of stringy dark meat, they are working muscles. The gizzard has a tough layer on it, you need to peel that off.
The liver has its own texture and flavor which many...
Are some of your serving pieces the back, neck, gizzard, heart, and liver? It may be too late for you but Mom started out serving all of the chicken. It's what the five kids grew up with so we just accepted those were normal pieces of chicken.