I don't know what that is in that picture, but it doesn't look anything like the souse meat, better known as head cheese, that my folks used to make. It is made by cooking down a hog head, usually split open, until all the meat falls off the various bones. I think, way back in the old days, some of the hog's hooves were included because that helped make the concoction congeal when cooled. Anyhow, the final product was finely chopped and seasoned with pepper, vinegar, and I'm sure other spices. It looked nothing like that picture. It was usually congealed in something about the shape and size of a loaf of bread. It could be sliced and fried, or sliced and eaten as a cold cut. I never really developed a taste for it, but my Daddy loved it.
Something I just couldn't stand to even smell cooking was the "liver and lights." This was the liver, heart, lungs, and other organs, taken from a freshly butchered hog, and cooked down in a mush along with copious amounts of black and red pepper.
All the old folks loved it.
All this was part of the Southern tradition and necessity of utilizing "everything but the squeal" when butchering hogs.