The preparation includes a long kneading period and a beating of the dough, which tightens it, producing a heavy, yeasted bread with a tight crumb. It used to be the bread given to fishermen and sailors.
Making this bread requires a long kneading session and vigorous mixing, which helps to tighten the dough and create a heavy, yeasted loaf with a compact texture. Historically, it was a staple food for fishermen and sailors.