The sugar that the ham can sometimes contain is part of the preparation of nitrifying salts. This type of salt contributes to the preservation of the product, in addition to help achieve the reddish tone in cured products.

This nitrifying salts, contains, among other things, a small amount of sugar that will be present in an almost insignificant way in the final product. Fermín has two product lines: hams and shoulders with nitrites and without nitrites.