A charcuterie scrap earns its place here by being crisp. Grattons are the bits of pork left after fat is rendered down: pieces of skin and meat fried in their own fat until they go brown, hard at the edges, and intensely savory. Spread or scattered onto split bread, occasionally with a smear of the fat they cooked in, they make a sandwich that is essentially salt, crackle, and pork. It belongs to Lyon, where grattons are a fixture of the charcuterie counter and the cooled fat is treated as part of the product rather than a byproduct.
The logic is textural before anything else. Grattons bring their own rendered fat, so the bread does not need butter; it needs a crust firm enough to stand against the crunch, because soft bread against a brittle filling reads as mush. The cure is forthright and salty, which sets the discipline: no competing cheese, no sauce, maybe a cornichon for one sharp note against the fat. The pieces are best scattered rather than packed so each keeps its snap to the bite. It is a cold sandwich whose entire appeal is the contrast between a yielding crumb and a filling that resists the teeth.
Variations stay on the Lyonnais charcuterie shelf rather than wandering off it. The same bread takes a thick-cut rosette, the slow-cured pork sausage of the region, or a smear of rillettes, the pork cooked down soft into its own fat, where grattons are the same animal taken the opposite direction, dried hard instead of spread soft. The Sandwich aux Grattons belongs with the dishes the catalog groups under Plat-en-Sandwich, the regional traditions packed into bread. Its specific contribution is crispness as the point: a charcuterie sandwich that succeeds on crackle, not on slices.